Mission Control shows no data after downloading 27.2

Since this started after updating to macOS 27.2, there may be a temporary issue with macOS, the Dock process, or the way Mission Control manages open windows and desktop Spaces.

It would be helpful to establish exactly what you are experiencing. For example:

• Does Mission Control open but show no application windows?

• Are your desktop Spaces missing?

• Does Mission Control open to a completely blank screen?

• Or does nothing happen when you try to open it?

In the meantime, here are a few troubleshooting steps worth trying.

1. Restart your Mac

Start with a simple restart, as this can resolve temporary problems following a macOS update.

After restarting:

• Open a couple of applications, such as Safari and Finder.

• Press Control + Up Arrow to open Mission Control.

• Check whether your open windows and desktop Spaces appear.

2. Restart the Dock process

Mission Control relies on the Dock process to manage desktop Spaces and window displays. Restarting it can sometimes clear temporary glitches.

• Open Finder > Applications > Utilities > Terminal.

• Type killall Dock and press Return.

• The Dock will briefly disappear and restart automatically.

This command will not delete your files, applications, or personal data.

Check Mission Control again.

3. Check your Mission Control settings

Open System Settings > Desktop & Dock and scroll down to Mission Control.

Check that the relevant settings have not changed following the update.

You can also temporarily disable automatic Space rearrangement to see whether this makes a difference.

Apple's guide provides further information:

Apple: Change Desktop & Dock settings on Mac

4. Test different ways of opening Mission Control

Try:

• Control + Up Arrow.

• Swiping upward with three fingers on your trackpad.

• Using the Mission Control keyboard key, if available.

If one method works but another does not, check your keyboard and trackpad shortcuts under System Settings.

Apple: View open windows and spaces in Mission Control

5. Disconnect external displays and accessories

If you use an external monitor, USB-C hub, or docking station, disconnect them temporarily.

Restart your Mac and test Mission Control using only the built-in display.

6. Check for third-party software interference

If you have applications that manage windows, desktop layouts, displays, or keyboard shortcuts, quit them temporarily and test Mission Control again.

7. Try Safe Mode

If the problem persists, try starting your M4 MacBook Air in Safe Mode. This can help establish whether third-party software or startup components are contributing to the problem.

Apple provides instructions here:

Apple: Start up your Mac in Safe Mode

8. Check for further macOS updates

Go to System Settings > General > Software Update and check whether a newer macOS update or supplemental update is available.

Apple: Update macOS on Mac

If the problem persists after these steps, I would recommend contacting Apple Support for further diagnostics rather than attempting more advanced system changes or reinstalling macOS unnecessarily.

Apple: Contact Support

A little more information would help narrow this down considerably. In particular, does Mission Control open normally but display no windows, or is the entire Mission Control screen blank?

Mission Control issues after updating to macOS 27.2 have need reported and may be caused by out-of-sync WindowServer/Space states or corrupted preference files. However, it is not clear exactly what you mean by 'no data'.

Quick Fixes to Try

Restart the Dock Process:

Mission Control is tied to the Dock. Restarting it often forces Mission Control to rebuild its window cache:

• Open Spotlight (Command + Space) and type Activity Monitor.
• Search for Dock in the top-right corner.
• Select the Dock process, click the Stop (X) button in the toolbar, and choose Force Quit. The Dock and Mission Control will restart automatically.

More info from Apple: Activity Monitor User Guide for Mac - Apple Support

Test the Add/Delete Desktop Trick:

Create a new temporary Desktop space via Mission Control, switch to it, and then delete it to flush out a black or frozen display state.

More info from Apple: View open windows and spaces in Mission Control on Mac

Restart Your Mac:

A standard reboot clears out temporary system caches.

Check Keyboard Shortcuts:

Go to System Settings > Keyboard > Keyboard Shortcuts > Mission Control to ensure your shortcuts are enabled and active.

Boot into Safe Mode:

Restart your Mac while holding down the Shift key to check if a third-party utility or screen-management extension is conflicting with Mission Control.

More info from Apple: Start up your Mac in safe mode - Apple Support

Personally, Mission Control is working as expected and as Apple documents on macOS 27.2.

Wayne Miller wrote:

Thank you for your reply. Yes, when I open Mission Control it is just blank. I tried most of your suggestions to resolve the issue but nothing seems to work. Perhaps I need to call Apple support.

Thank you for the additional information.

Since you have already tried the suggested troubleshooting steps, including Safe Mode, without any substantial improvement, I think it would be sensible to move on to two further diagnostic tests before considering more extensive changes to macOS.

1. Run an EtreCheck diagnostic report

I would suggest downloading and running EtreCheckPro, a diagnostic utility designed to examine the configuration and software environment of your Mac.

Website: https://etrecheck.com/

For this particular problem, I would be interested in examining:

• Third-party applications that manage windows, displays or desktop Spaces.
• Login items and background processes.
• Launch Agents and Launch Daemons.
• System extensions and potentially conflicting software.
• Any relevant diagnostic reports or unusual system configuration.

An important clarification about EtreCheck:

EtreCheck is an information-gathering and diagnostic reporting utility, not a dedicated macOS repair tool.

It can identify potentially problematic software, unusual configurations and certain reported errors. However, it cannot directly test the internal operation of Mission Control, establish conclusively why it is displaying a blank screen, or guarantee that it will identify the underlying fault.

It may also not reveal an underlying macOS bug or a problem within Apple's own system components.

Consequently, I would treat its report as supporting diagnostic evidence rather than a definitive diagnosis.

For now, simply generate the report. Do not use any automatic cleaning, removal or repair options. The report can then be shared for further examination. Please review it for personal information before posting it publicly.

The application is free or paid for added features. 

The Report will Not Reveal Any Personal Information. 

Post back the Full Report - Share Report >> Copy , then  paste  >>>> using the Additional Text Icon  <<<<

2. Test Mission Control using a secondary macOS user account

This is an important diagnostic step because it can help establish whether the problem is specific to your existing user account or affects macOS more generally.

To do this:

1. Open System Settings.
2. Select Users & Groups.
3. Choose Add User.
4. Create a temporary Standard user account.
5. Log out of your normal account and log into the new account.
6. Open Safari and Finder.
7. Press Control + Up Arrow to launch Mission Control.

Check whether the application windows and desktop Spaces appear normally.

There is no need to transfer any files or change anything in your original account.

What the results will tell us

• If Mission Control works in the secondary account: This suggests that something within your original user account, such as a preference, configuration or user-specific software, may be responsible.

• If Mission Control is still completely blank: This points towards a possible system-wide macOS issue, although it does not prove that macOS itself is at fault.

My recommendation

I would like to see the EtreCheck report and know the outcome of the secondary-account test before recommending anything further.

Together, these two tests should give us a much clearer picture of what is happening and help avoid unnecessary changes, such as deleting system preference files or reinstalling macOS without first establishing a likely cause.

If neither test identifies a likely explanation, contacting Apple Support with the diagnostic findings would be the sensible next step.

A completely blank Mission Control made no sense to me, so I surmise "no data" meant just that. Nothing there.

If there were no available windows then "No Available Windows" would appear in the center of the screen. Since not even that appears, reinstalling macOS is justified. It does not usually fix things though, so if it still fails to work contact Apple Support.

I'm not quite sure what "no data" means.

View open windows and spaces in Mission Control on Mac - Apple Support

Thank you for your reply. Yes, when I open Mission Control it is just blank. I tried most of your suggestions to resolve the issue but nothing seems to work. Perhaps I need to call Apple support.

Sorry. What I meant is that there are no apps there & it just remains blank. I have tried various solutions to no avail. Perhaps I need to contact Apple support. Thank you.