In such instances, it appears the issue stems from compatibility issues involving the app, macOS Mojave, and the NVIDIA graphics processing unit. The following are the easiest ways to fix a flickering screen issue on macOS 10.14: 1. Uninstall Chromium Completely. The screen issue has been particularly associated with the use of Chromium.

  • A number of Mac owners have confirmed that some of their favorite apps fail to work after updating to macOS Mojave. If you are dealing with the issue, then try restarting your Mac and then re-launch the app. If the problem still persists, then uninstall the app, then head to the Mac App Store and re-install it.
  • To exclude an app from dark mode in macOS Mojave, we first need to know the app’s Bundle Identifier. To find it, open Terminal and enter the following command. Note that “App Name” is the exact name of the application minus its extension. In our Notes app example, our App Name is simply “Notes”: osascript -e 'id of app 'App Name'.
  • Mac Does Not Power On. Desktop Users: Check the power connection, switch, and the power cord.

Find that the Mail app randomly opens while you are working on your Mac running macOS Mojave?

There have been similar cases like this, with several users having reported it over on the forums. Apparently, the Mail app will just pop up into the screen while you are working on your Mac. It is indeed frustrating to have to minimize or close it from time to time, which interrupts your attention.

Now there are a couple of factors that can cause this issue, especially on the software level. It may well be an incorrect configuration in your Mac, a third-party email account conflict, or a software glitch. Whatever the cause is, there is always a fix for a particular issue. If not, a temporary workaround can be applied until a permanent fix is applied.

In this guide, we will discuss the probable causes of this together as well as share the suitable fixes associated with it. Hopefully, by the end of this guide, you will be able to fix your Mail app that opens randomly on Mojave.

Without further ado, let’s dive in!

TABLE OF CONTENTS

How to Fix Mail App Opens Randomly Mojave: 10 Ways

1. Update macOS Mojave.

The first and most likely cause which your Mail app is not behaving normally is because of a bug in the macOS Mojave version itself.

To fix this issue with the Mail app, you must make sure that your macOS version is also up to date. It’s possible that by the time you read this post that Apple may have already addressed this bug and released a patch for you to install.

Here’s how you can install the latest macOS updates on your Mac if you haven’t already:

  1. Go ahead and click on the Apple menu icon, then the System Preferences option, and then click on the Software Update option.
  2. Then, click on the Update Now option to install it. If you can’t find this option, that means your software is already up to date.
  1. Finally, you can opt to click on the More info option to view details about the update. If you are an advanced user, you can choose a specific update to install and ignore the ones that are not relevant to your application.

Once you see the message that your macOS is updated, your applications such as your Mail app and other Apple core applications will also have been updated. You may test once again by carrying out your everyday tasks with your Mac and see if the Mail app opens randomly again.

2. Check your Mail Settings.

Another possibility why your Mail app is popping up randomly onto the screen is because it may have been misconfigured without you knowing it. This happens especially if we’ve made any changes to the Mac, such as recently downloading a new application or updating the macOS. We will not know for sure where the issue exactly is, but the following steps will be helpful to check and verify if the configurations for the Mail app are correct and should behave the way it was intended.

Take note there are two parts to do this: 1) Mail App Settings and 2) macOS settings. We will go over both and show which of all the settings are required and which are not.

Here’s what you need to do in your Mail app settings:

  1. Go ahead and click your Mail app, then click on the Preferences option and then General option.
  2. Then, on the Check for New Messages option, click on the choices, and set the value to Manually. You will get to see new messages if only you click on the Get Mail button.
  1. In the same setting page, uncheck the box where it says Prefer opening messages in split view when in full screen. This will prevent opening a split view window when there are any notifications from your Mail app.
  2. Now click on the Rules tab on the top section and check the email rules that are currently set up for your Mail app. If there are rules that use a script that triggers a notification, select the name of the rule on the list, and click on the (-) remove option.
  3. Finally, close your email app and relaunch it. Minimize your mail app by clicking on the yellow ( – ) button at the top right corner of your application window.

The above changes will directly affect how your Mail app behaves but does not address the macOS itself, which we will be the next part we will go through.

Here’s what you should do in your macOS settings:

  1. Go ahead and click on the Apple menu icon, then click on the System Preferences option.
  2. Then, click on the Mission Control option and uncheck the box that says Displays have separate Spaces. This will avoid triggering split display if you are previously using multiple displays.
  3. Now go back to the System Preferences page, and click on the Users & Groups option.
  4. Next, click on the Login Items option and look for your email account or any account associated with your Mail app on the list. Click on ( – ) or remove option, and this will prevent your application from opening automatically after logging in to macOS.
  1. After that, go back to the System Preferences page, and click on the Energy Saver option. Then, uncheck the Enable Power Nap checkbox to prevent checking new email messages when your macOS goes to sleep.
  1. Finally, restart your macOS Mojave by clicking on the Apple menu icon and click on the Restart option.

After your Mac successfully starts up, the Mail application should not open on its own automatically. If you wish to use the Mail application, then you may launch it and opt to minimize it so that it stays in the background. Again you should find that after completing the above steps that the Mail app will not annoyingly abrupt you during your work. If you still find that the issue persists, then keep reading.

3. Uninstall Any Third-Party Email Software.

Several users have also found this issue also occurred due to a conflict between the Mail app and third-party installed email services. This issue is similar to when you have two antivirus software installed on a machine. Since both services use the same protocol and resources, it can cause problems with your system.

To fix it, you will need to temporarily uninstall any third-party email software which you have installed on your Mac and then retry using the Mail app.

Here’s how you can do it:

  1. Go ahead and click on the Finder icon in the Dock section of your macOS Mojave and click on Applications in the Finder sidebar.
  2. Then, find and double-click the Uninstall (App) or (App) Uninstaller on the 3rd party email software folder for the uninstall process.
  3. Now, if the application does not have the uninstaller program, drag the 3rd party email software folder or icon to the Trash at the end of the Dock section.
  4. Finally, repeat the steps above if you have more 3rd party email software installed in your macOS Mojave.

If your application was purchased from the App Store, learn how to uninstall the app using Launchpad.

4. Disable Google Calendar Notification.

If you are using a Gmail account on your Mail app, then you might want to check your Calendar notifications setting.

Google’s Calendar app is notorious for having issues with how their notifications work. So if you use it extensively, you will want to make sure that the settings for the notifications are disabled. For instance, there is a hidden schedule notification inside your Google Calendar that has been reported by users to be the cause of this random pop-up issue on your Mail app. We will guide you on how to locate this setting as well as all the other settings that you should disable to prevent notifications from the Google Calendar to pop-up.

Here’s what you should do:

  1. Go ahead and log in to your Google Calendar page using your web browser.
  2. Then, click the gear icon on the upper-right corner of the page and then click the Settings option on the drop-down menu.
  1. Now, click on your calendar name under Settings for my calendars section and click on the Event Notifications.
  2. Check for the email notification schedule if there’s any. If there is an email notification set up, remove it by clicking the ( X ) icon or Remove Notification option.
  1. Also, scroll down on the All-day Event Notification section and do the same procedure in Step 4.
  2. Next, on the Other notifications section, change the drop-down choices from “Email” to “None” value to remove email notifications.
  1. Finally, close your Mail app and relaunch it.

Having disabled all of the hidden notification options in your Google Calendar, any events or actions related to the Google Calendar from your Gmail account will not be notified. This will help stop your Mail from suddenly popping-up on your screen every time there’s a hidden notification in your Gmail account.

5. Generate New App Password for Gmail.

Again this is primarily directed to users who have a Gmail account.

Gmail recommends from the moment you sign up with them that you add an extra layer of security for your email accounts. That’s a good thing! But sometimes, this additional layer of security messes up the way the Gmail account is synced with your Mail app. It may notify you unconventionally that your application is not safe because the application identifies it as a third-party email address account. Hence, it does not have a proper notification protocol to notify the user with contrary to what Apple provides it.

One safe and secure way to go about this is to generate a new password for it via your Mail app.

Here’s how you can do it:

  1. Go ahead and click Mail option on your Mail app on your macOS Mojave.
  2. Then, click the Preferences option and then click the Accounts option.
  3. Now, select your Gmail account and then click on ( – ) icon or also known as the Remove option.
  1. After that, close your Mail app and relaunch it.
  2. Go back to the Mail option, then click on Preferences, and then Accounts option.
  3. Next, click on the ( + ) icon or also known as the Add Account option, choose the “Other Mail Account…” option instead, and enter your full Gmail email account address.
  1. Then, launch your web browser and sign in to your Google Accounts page.
  2. Click on the Security option on the left side and go to the Signing in to Google section. Generate an application password for your Mail app using the App Password option and follow the instructions.
  3. Finally, go back to your Mail app and use the app password that is newly generated to sign in your Gmail account on your Mail app.

Now that your Gmail account has a new app password for your Mail app, it should not notify you that you need to secure your account. If the issue persists, keep reading as we’ve got five more methods for you to try out.

6. Remove Email Account from Mail App and Forward All Emails.

This is an alternative solution in case none of the solutions above work for you.

For instance, if you are having a hard time setting up your Gmail account, then you can opt to remove it from your Mail app if it continuously causes you trouble. You can refer to the Steps 1 to 4 of the previous method on how to remove your Gmail account from your Mail app.

⚠️ Note

This method can also be applied with other email services such as Microsoft Outlook, Yahoo, and Zoho. Please refer to the links attached for the respective guides on how to set it up for those services.

If you do proceed with removing your Gmail account from your Mail app, then the following workaround can help set up a forward filter on all of your emails on your Gmail account to your primary email account. This ensures that you are kept notified with the emails but without having the actual account on your device.

Here’s how you can do it according to Google Support:

  1. Go ahead and log in to your Gmail account using a web browser.
  2. Then, click on the gear icon or Settings at the top-right portion of the page.
  3. Now, click Settings on the drop-down menu and click on the Forwarding and POP/IMAP option.
  4. Scroll down to the Forwarding section and click the Add a forwarding address option. The forwarded address can be your main email address or an email address where you prefer your emails to be forwarded to.
  1. Enter your primary email address to the space provided and click on Next, then Proceed, and then the OK option.
  2. Check your primary email address and check for a verification message. Click the verification link in that message.
  3. Next, go back to the page where your Gmail setting is and refresh the page.
  4. Again, click the Forwarding and POP/IMAP option and scroll down to the Forwarding section. Choose Forward a copy of incoming email to option and choose to keep Gmail’s copy in the inbox.
  5. Finally, scroll down at the bottom of the page and click Save Changes.

With the forwarded setup shown above, you can have your Gmail messages appear in your primary email account on your Mail app, which should stop the conflicts. Again, this is a workaround to the other methods, so it is up to you whether you want to go through with this solution.

7. Force Quit Mail App.

If you haven’t already force quit your Mail app on your Mac, then it’s certainly worth doing so. By force quitting your Mail application, you’re inherently terminating its process, which will allow you to jumpstart it.

Doing this doesn’t mean your email account will miss out on any new emails since we’re just restarting the Mail app itself and not your email account. It’s a useful trick which we’ve found to be extremely effective from our previous guide on tackling the various issues with the Mail app on macOS Catalina.

To do this, you will need to press and hold the Option, Command, and Esc (escape) keys simultaneously on your keyboard to open the Force Quit window.

Under the Force Quit Application section, a list of applications that are launched will be provided. Search and click the Mail app on the list and click on the Force Quit button at the bottom.

This will terminate the Mail application, and you will not be bothered by it until you relaunch the Mail app. Try it and see if it works. Let us know down below whether this method works for you.

8. Prevent Applications from Re-Opening.

It is also possible that you have previously opened the Mail application before the shutdown or sleep process. There is a feature on your Mac that allows you to resume the applications you are working on after you restart or resume from a sleep process. So your Mail will still be running in the background and might be able to disturb you when you are working on your computer.

To fix this, you need to deselect” Reopen windows when logging back in” option when prompted before the restart process. This will prevent all applications to open automatically after you log back into your Mac. With this, you get to choose to open the applications you only need at the moment.

Another way to close applications and prevent them from reopening is in your Mac’s settings. To locate these settings, click on the Apple menu icon, then click on System Preferences. Next, click on the General option. Now scroll down and check the box that says “Close window when quitting an app” option. Selecting this option will proceed to close the Mail app window as soon as you’re done using the Mail app.

9. Restart Device in Safe Mode.

Restarting your Mac is a standard de-facto solution for most issues experienced. It is an effective solution that is recommended by Apple themselves, especially if there are errors encountered in the operating system (OS) level.

It’s a relatively quick method and does not result in any of your data or information being erased. You can verify this by going onto Apple’s documentation for carrying out Safe Mode for Mac machines.

Here’s how you can do it:

  1. Go ahead and restart your macOS Mojave by clicking on the Apple menu icon, and then click on the Restart option.
  1. Then immediately press and hold the Shift key on your keyboard until the Apple logo appears. If you don’t see the Apple logo, learn what to do.
  2. Next, release the Shift key when the login window appears. If your startup disk is encrypted, learn more about what to do.
  3. Finally, when your macOS has fully loaded, restart your computer by clicking on the Apple menu icon and click on the Restart option. Do not press any keys to startup normally.

By doing this process, here are the things that it does to your Mac:

  • Safe mode verifies your startup disk and attempts to repair directory issues if needed.
  • It loads only required or core kernel extensions.
  • The process prevents startup items and login items from opening automatically that may have conflicts with your other applications.
  • It also disables user-installed fonts and other customized settings.
  • Finally, it deletes font caches, kernel cache, and other system cache files

If the Mail app issue persists even after you the process, you will also want to check if your Mac may have incompatible login items. But most of the time, by carrying out the Safe Mode restart, the issue will get resolved as your system cache will have been rebuilt and updated.

10. Contact Apple Support.

If none of the solutions in this guide work for you or if you find solutions such as restarting using the Safe Mode a little too complicated, then we always recommend that you bring in your Mac to your nearest Apple Store. They can cover pretty much anything with regards to Apple products, especially software and hardware repair.

Moreover, if you have done everything you can from this guide and think that this is a bug with macOS Mojave itself, then we ask that you write a feedback to Apple. This way, you will be helping them collect the data they need to fast track the bug fix process. Be sure to mention what version of Mail app and macOS Mojave you are using. The more of us who report, the sooner we can get a patch for it. 🙂

As we close this guide for today, we would like to thank you for reading and supporting us. We hope that this article has helped you fix your “Mail app opens randomly in Mojave (macOS)” issue. If you have questions related to this topic, please feel free to leave a comment below, and we will love to help out. ❤

If this guide helped you, please share it. 🙂

After years of mountain-inspired operating systems, macOS Mojave feels like a catch of fresh air for Apple. Who wouldn’t be tempted to lay hands on its gorgeous Dark Mode? But as it often happens with new products, you should be aware of glitches, bugs, and all kinds of compatibility paradoxes. There are a few already known macOS Mojave problems that we will cover in this article.

Before September 2018 macOS Mojave was only available as a Beta via Apple developer account. It's been 7 months since it went public but if you want to get early access to future OS updates, you might consider becoming an Apple Developer. This privileged club costs $99 per year to join and in exchange, you'll be the first to lay your hands on Apple’s fresh releases.

List of most common Mojave problems

Here is the list of most common Mojave issues that have been reported so far.

1. macOS Mojave install stuck

Is your Mac compatible with macOS Mojave?

One of the most reported macOS Mojave problems is a Mac getting stuck in the middle of the Mojave installation. A simple explanation — your Mac is just not technically fit to run Mojave. According to Apple, macOS 10.14 can be launched only on Macs not older than from 2012. If yours was released earlier — sorry, you’ll have to miss this update.
Below is the list of Mac models compatible with Mojave:

  • MacBook (Early 2015 or higher)
  • MacBook Air (Mid 2012 or higher)
  • MacBook Pro (Mid 2012 or higher)
  • Mac Mini (Late 2012 or higher)
  • iMac (Late 2012 or higher)
  • iMac Pro (2017)
  • Mac Pro (Late 2013, mid 2010, mid 2012 models)

Try reinstalling macOS Mojave from scratch

Okay, let’s assume your Mac is fully compatible with macOS Mojave. But still you get something like 'Installation of macOS could not continue' on your screen. What’s causing the installation trouble then? If your Mojave update stuck or ends abruptly, you should go back to square one and do it properly this time around. The recommended procedure requires backing your Mac up and cleaning your Mac from “old baggage” that may interfere with the macOS update.

Step 1. Clean up your Mac from system junk

As a general rule, a fresh macOS requires a fresh hard drive. There are tons of outdated caches, app leftovers, plugins, and system logs on any given Mac. Not only they take a lot of space but may also be causing various kernel-level errors. To clear them away, use a dedicated Mac cleanup app — you’ll be able to delete hidden junk that you otherwise can’t access. Among many alternatives, the simpler solution is CleanMyMac X, which has proved quite effective in cleaning my MacBook Pro (15-inch, 512 GB).

  1. Download CleanMyMac for free from developer’s site.
  2. Click Smart Scan.
  3. Remove hidden junk from all the suggested folders.

Now your Mac is ready to install macOS Mojave on top of your current OS. What’s left is to prepare the data backup in case something goes wrong.

Step 2. Back up your Mac

  1. Connect external drive and launch Time Machine.
  2. Switch Time Machine to “On” position.
  3. Choose external drive as a backup path.
  4. Click “Backup Now.”

Step 3. Reinstall macOS Mojave

Now, delete the previously downloaded macOS Mojave installation (find it in your Downloads) and restart your computer. Next up, re-download the installation file from your Apple Developer Account or from the Mac App Store.

What else you might try?

You have downloaded the macOS Mojave and still cannot go past “Preparing the installation…” window. Let’s admit, new macOS versions are often buggy and problematic but here are a few more ideas to try.

  • Start your Mac in Recovery Mode. To enter Recovery Mode on Mojave, Click Apple logo > Restart. Right after that hold down Command + R buttons while your Mac is restarting. While in Recovery Mode you’ll be able to run Disk Utility to check your disk for consistency.

  • Disable your antivirus software if you have any installed. Sometimes such apps would block any new installation attempts — a classic case of overprotection.

Mac app store mojave

2. Can’t install the Mojave on an external drive

Some folks have reported they have ran into trouble trying to install macOS Mojave onto an external SSD drive. The installation would abort midway and eventually drop you back into High Sierra. As some bloggers have pointed out, the issue is caused by a USB-C adaptor connected to MacBook.
The solution suggested on Mac forums would be to connect the SSD via Thunderbolt 3 port. If you haven’t got a similar dock available, but your external drive has a Thunderbolt 1 or 2 port, try connecting it direct using a Thunderbolt 3 to 2 adaptor. Hopefully, this time it should work.
One more suggestion is to go the radical way and perform a clean install of macOS 10.13 High Sierra and then go a one step up to macOS Mojave.

How To Quit Screen App Mac Mojave Safari

3. iCloud is not syncing properly

The first editions of macOS 10.14 Mojave seemed to be lacking some basic iCloud features which will likely be added in the next updates. One of those missing bits is Back to My Mac functionality (remote access to files and screen sharing). But the most annoying setback is iCloud not syncing properly.

How to fix it? First, sign out from the iCloud account and sign in back again.

  1. Select Apple icon > System Preferences.
  2. Select iCloud > Sign Out.

Then, similarly, log in back to your account. If that doesn’t resolve the syncing issue, delete the iCloud-linked folder “Cloud Docs” in the Finder. This will cause your Mac to download iCloud drive files and re-establish the connection.

  1. Click on Finder > Go > Go to folder… (in the upper menu).
  2. Find the CloudDocs folder and delete it.

In addition to that you’d want to stop a couple of iCloud-related process in Activity Monitor. This will reboot iCloud syncing from the ground up.

  1. Go to LaunchPad > Activity Monitor.
  2. Type “cloudd” in the search bar above.
  3. Click on big [x] Quit button.

Repeat the same steps for “bird” process.

Since iMessages syncing has been added to macOS Mojave (cool!) this too may not work properly after the update. To fix it, you must apply the ancient “switch it off and on again” principle that works equally well for your home appliances. Simply disable and then re-enable iMessages syncing via iCloud to get it going like it should

How To Quit Screen App Mac Mojave Mac

4. Bluetooth issues on macOS Mojave

Bluetooth connection not working on macOS 10.14 Mojave is a known issue too. The symptoms look like your Mac just wouldn’t connect to Bluetooth, or in some cases, refuse to turn itself off.

To address this injustice, it’s recommended to delete the Bluetooth plist file — don’t worry it will recreate itself upon the next Bluetooth launch. But just in case, copy the file to some safe location.

  1. Click on Finder > Go to Folder…
  2. Type in /Library/Preferences.
  3. Find com.apple.Bluetooth.plist file and delete it.
  4. Restart your Mac.

5. macOS Mojave crashing at login

This macOS Mojave problem is quite typical. With every new macOS you can always expect some degree of mis-coordination between the OS and Apple default apps. The same refers to your third-party apps that launch automatically upon startup — they may not even be yet supported in the current version of macOS Mojave. As a result, you see your MacBook running slow after the Mojave update. What you can do is this:

Disable the unwanted Login Items

So how can you fix macOS Mojave crashing at login? Luckily, this issue is nicely tackled with the previously mentioned CleanMyMac X. It allows you to remove Login Items one by one so you can see which app was causing the macOS to crash. Disabling Login items with CleanMyMac at first may seem like an extra step but it’s worth it.

  1. Download CleanMyMac tool — a free download from developer’s site
  2. In the sidebar, find Optimization > Login items
  3. Disable potentially problematic Login Items

Using the same tool you can also trim down the so-called Launch Agents or Daemons. These are small helper applications that run in the background and extend the functionality of the main app, like Skype. Once again, your logic is to switch off one app at a time to see if fixes the problem.

Delete specific plist files in Preferences

A user on MacRumors forum suggested another possible solution. This annoying macOS Mojave problem can be fixed by removing the potentially corrupted property list (plist) files in Preferences. These files contain individual user settings for various parts of the macOS (Finder, Desktop, Applications). Resetting them may be just the solution you need. To proceed, you will need to start your Mac in the Safe Mode.

To enter Safe Mode, hold down Shift when your Mac is booting up. Let go of the Shift key when you see Apple logo appearing on the screen.

1. Click Finder > Go > Go to Folder…
2. Paste in: ~/Library/Preferences/
Note: copy this entire folder
3. Delete plist files for Finder or Desktop.
Restart your computer to see if that fixed the issue. If not, the optimal solution would be to revert to macOS High Sierra and wait for the next macOS Mojave updates from Apple. To go back to your previous macOS, install it from Time Machine backup that we are sure you had meticulously prepared.

6. Mac running slow after Mojave update

So you’ve successfully installed macOS 10.14 Mojave to find out that your Mac’s performance got worse. This maybe not a Mojave-specific issue, though. Normally, people judge the efficiency of their Mac by looking at speed of their most-used apps. If your Mac hangs while you’re using Skype, for example, this may be due to Skype conflicting with the Mojave, thus a completely an app-related problem. But, anyway, it’s a good idea to do a basic health check of your system.

Fixes for a slow performance on Mojave:

1. Clean up your Desktop

Remember, every desktop icon takes up RAM space. Fewer icons — the faster your Mac gets. When your Desktop is clean, restart your computer. Newly-introduced 'Desktop Stacks' feature on macOS Mojave lets you put those icons in order.

2. Update all your apps to their latest versions

As you’re reading this, macOS developers around the world are adjusting their apps before to macOS Mojave before it goes public. Update everything to the last version available — some apps have already been fixed.

3. Check your Activity Monitor

Go to Launchpad > Activity monitor. Quit apps and processes that take up the unfair amount of memory.

4. Remove system junk and app cache

Outdated cache files, redundant support files, and logs generated by all your apps can slow even a powerful Mac down to a crawl. Remember how fast and efficient your Mac was straight from the store? You can partially restore this original power by cleaning up your Mac from top to bottom, or from Finder to Library, if you like. CleanMyMac X is a great app that can clean all sort of junk and clutter from your hard drive.

Things that deserve being removed:

  • System junk
  • App caches
  • Unused apps
  • Old iOS updates
  • Extra localizations

You can download a free CleanMyMac version here. It cleans all the items described above.

7. Quit apps keep showing in the Dock

The latest update to macOS Mojave introduced a new feature that leaves many of us, Apple fans, disappointed. Now the default behaviour of macOS Mojave is to show you 3 most recently used applications in the Dock. So if you have just quit an app and it still shows up in the Dock, it’s not a bug but a feature. Luckily, an easy reversible one.

  1. Go to System Preferences > Dock.
  2. Untick “Show recent applications in Dock.”

After all, the Dock is a customizable corner of the macOS and it should be left to the user to decide what to put in there.

8. Third-party apps not working on macOS Mojave

The main problem here is 32-bit/62-bit distinction. Apple stated that macOS High Sierra is the last operating system to support 32-bit optimized applications. From then on, if an app isn’t updated for 64-bit architecture, you won’t be able to use it on Mojave. This is one of the reasons not to update and stay with the good old High Sierra on your Mac.

How to find apps that are not Mojave-compatible?

Before you upgrade to macOS Mojave, check for compatibility issues. Here's how to do that:

  1. Click on Apple logo > About this Mac.
  2. Click on System report > Applications.

Now, look for the last column 64- bit in the window that opens. “Yes” indicates that the app in question is ready to run on macOS Mojave. Sadly enough, even some of Apple’s native 32-bit apps will not be supported on macOS Mojave. This includes Aperture, old version of iWork, and old version of Final Cut Studio.

Other notable 32-bit apps are Microsoft Office’s Powerpoint 2011, Outlook 2011, Word 2011, Excel 2011. The adequate answer to that is to update these apps to newer versions. Or you could also:

  • Run macOS Mojave alongside macOS High Sierra, with Parallels
  • Not to update to macOS Mojave
  • Reach out to app’s developer and ask them for advice
  • Consider transitioning to a different app

How to check 32-bit apps on macOS Mojave

However, if you've already upgraded to the new OS and need to check the incompatible software, you have to follow a bit different steps than mentioned above. In Mojave, 32-bit apps can be reviewed in System Information:

  1. Click on Apple logo > About This Mac.
  2. Click on System Report.
  3. Choose Software > Legacy Software.

That's how you can get an overview of 32-bit apps on your Mac if Mojave is installed on your Mac. Developers are highly encouraged to migrate to 64-bit framework but it will take some time. So, if you need to remove the incompatible apps from your system, check a few tips below.

An app is 'not optimized for your Mac and needs to be updated'

When you see this rather discouraging message you may simply want to uninstall the app — a radical solution to the problem. To make things easier, the Uninstaller tool in CleanMyMac has a special tab that will show you all 32-bit apps you have on your Mac. From there you are one click away from deleting them all at once:

My app is 64-bit but still not working on Mojave

This happens too. In this case, you can download the app again and try to re-install it from scratch. There is a more elegant solution, though. CleanMyMac tool, mentioned in this article has a tool to reset the apps to their original state, notably, without losing your user settings.

  1. Open CleanMyMac (Download it free here).
  2. Go to Uninstaller section.
  3. Select the application that you wish to reset.
  4. Click Application Reset in the dropdown menu.

Using this method I was able to successfully fix my Evernote app failing to sync after the last update.

Since we're talking app versions, one more use of this versatile program is to update your applications to the latest versions. Instead of googling for the latest version of app X, Y, Z, you can update everything in one shot — just what Updater tool in CleanMyMac X does.

9. Time machine is not working on Mojave

Many people report that after upgrading to macOS Mojave, Time Machine isn’t able to complete a backup. Unfortunately, this problem isn’t fixed yet, so keep an eye on software updates in the Mac App Store.

Before that, if you don’t want to risk losing your important files, consider some alternative backup options. You can transfer files to an external drive, iCloud, etc. For more information, check out this article about different ways to back up your Mac.

10. macOS Mojave battery problems

Since installing macOS Mojave the battery life of your MacBook has become shorter? Then it’s time to check what’s causing the battery drain on your Mac. Here’s how to do that:

  1. Open Finder.
  2. Go to Applications > Utilities.
  3. Choose Activity Monitor.
  4. Click Energy.

From there you can see how much energy your programs are taking up. If it’s a lot, you may consider uninstalling some apps.

If you want to monitor your battery health and get alerts when something goes wrong, I recommend using CleanMyMac’s Menu. One click and you know the most resource-consuming apps, health indicators of your battery, hard drive, and memory.

You can also check an article about increasing Mac battery life, it’s full of useful tips.

11. Wi-Fi not working after installing Mojave

How To Quit Screen App Mac Mojave 10.14

If you’re having troubles with connecting to the internet, try starting your Mac in Safe Mode and check the connection. If you’re not sure how to do that, here’s a detailed guide how to use Safe Mode.

If Wi-Fi works in Safe Mode on Mojave, then it means there’s an issue with an app or extension you installed. Make sure that all your apps are updated to the latest versions to avoid the compatibility issues. To do that quickly, use the Updater tool in CleanMyMac X utility. With its help, you can easily get the latest and the most reliable versions of all your applications.

Here’s how to use CleanMyMac’s Updater:

  1. Download the app (for free) and launch it.
  2. Choose Updater tab.
  3. Check the app and click Update.

That’s it! Now you are up-to-date.

12. File thumbnails don’t show on the desktop

Some people reported that after installing Mojave, thumbnail previews of some files, such as photos and PDFs, don’t show up.

One thing you can try is removing the cache files by starting your Mac in Safe Mode, then shutting it down and restarting normally. But I recommend using CleanMyMac in this case. It helped me to get all my files previews back. After launching the app, go to System Junk to remove the caches, and then use Maintenance utility to Run Maintenance Scripts.

13. Zero-day bug

A zero-day vulnerability has been revealed by a security researcher Patrick Wardle just after Mojave launch. This bug can allow an attacker to use a malicious app in order to steal your personal data, such as contact details from your Mac.

Patrick highlighted it on Twitter with a video that shows how he tries to access the address book on Mojave, and failing, before running a script simulating a malicious app which finally allows to access the address book and copying the data.

As macOS security is a hot topic, probably a day-zero bug will be fixed soon, as well other Mojave bugs and issues. Meanwhile, stay tuned — I’ll update the article once Apple releases an update that addresses this problem.

With several drawbacks mentioned in this article, macOS 10.14 Mojave still looks like a great step ahead. It’s cool and more powerful than anyone thought possible. We’ll be updating this article as soon as new macOS Mojave issues get reported. Meanwhile, welcome to the Dark Side Mode!

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