Mission Control Not Working on macOS 27? How to Fix It

You updated to macOS 27 Golden Gate, swiped up with three fingers, and Mission Control stuttered its way onto the screen. A desktop you dragged to your second monitor left behind a black rectangle with nothing to click. Or your Logitech mouse button for Spaces stopped doing anything at all.

Apple released macOS 27 on September 14, 2026, and Mission Control complaints showed up on the MacRumors forums and Reddit within the first day. The good news: most of these problems come from stale Spaces data, animation settings, or outdated third-party utilities, and each one has a fix you run in a few minutes.

Key Takeaways

• Restart the Dock with killall Dock first. It relaunches Mission Control and clears most freezes in seconds.
• A stuck black screen on a second display goes away when you add a new desktop on it, switch to it, and delete it.
• Resetting the saved Spaces file fixes shuffled, missing, or frozen desktops without touching your files.
• Gesture problems with mouse utilities such as Mac Mouse Fix need an updated build written for macOS 27.

What Is Wrong With Mission Control on macOS 27?

Golden Gate changed how the system draws and animates Spaces, and the update carried over old Spaces data from macOS Tahoe. The mix produces laggy animations, black screens on external displays, and full-screen apps refusing to switch.

Here are the symptoms reported most often since launch:

• Mission Control opens with a choppy, low-frame-rate animation
• Dragging a desktop from one display to another leaves an unresponsive black screen behind
• Switching to a full-screen app flashes the screen and then stays on the current app
• Windows go missing from Mission Control or appear offset on the wrong display
• Mission Control and Spaces gestures from third-party mouse and trackpad utilities stop working, while the built-in trackpad works fine

If your problem matches one of these, work through the fixes below in order. Each step takes a few minutes, and the first two are the fastest to try.

How Do I Restart Mission Control Without Rebooting?

Quit and relaunch the Dock. Mission Control runs inside the Dock process, so restarting it clears a frozen or glitching Mission Control in about two seconds, with no restart and no lost work.

1. Open Terminal from Applications, then Utilities.
2. Type killall Dock and press Return.
3. The Dock and menu bar blink off and back on.
4. Open Mission Control again with Control-Up Arrow or a three-finger swipe up.

Your open apps and windows stay where they are. Keep this command handy for the next few weeks, since the glitch returns for some people after waking from sleep until Apple ships a fix.

How Do I Fix the Black Screen on My Second Monitor?

Create a new desktop on the display showing black, switch to it, then delete it. This forces macOS 27 to redraw the Spaces on both displays and releases the stuck one.

1. Press Control-Up Arrow to open Mission Control.
2. Move your pointer to the top of the display showing black.
3. Click the + button at the top right of the Spaces bar to add a desktop.
4. Click the new desktop to switch to it.
5. Open Mission Control again, hover over the new desktop, and click the X to remove it.

To keep this from happening again, avoid dragging whole desktops between monitors until Apple patches the bug. Move individual windows instead. For full-screen apps, exit full screen with Control-Command-F, drag the window to the other display, and enter full screen again there.

How Do I Reset Spaces on macOS 27?

Delete the saved Spaces preference file and restart the Dock. This wipes the desktop layout macOS carried over from Tahoe and gives Mission Control a clean start. Your files and apps are not affected.

Run these two commands in Terminal, one at a time:

defaults delete com.apple.spaces
killall Dock

Then log out from the Apple menu and log back in. After the reset, you have a single desktop per display. Rebuild your extra desktops in Mission Control with the + button. To pin an app to a desktop again, right-click its Dock icon, choose Options, and select This Desktop under "Assign To."

This step fixes desktops rearranging themselves, windows disappearing from Mission Control, and full-screen apps getting stuck between Spaces. Expect about five minutes to put your layout back together.

Which Mission Control Settings Should I Change?

Turn off automatic Space rearranging and check the display setting. Two toggles in Desktop & Dock cause most of the shuffling and switching complaints on macOS 27.

1. Open System Settings and click Desktop & Dock in the sidebar.
2. Scroll down to the Mission Control section.
3. Turn off Automatically rearrange Spaces based on most recent use. This stops desktops from changing order each time you switch apps.
4. Check Displays have separate Spaces. If you use more than one monitor, leave it on. Changing this setting requires a log out before it takes effect.
5. If you jump to the wrong desktop when you click a Dock icon, turn off When switching to an application, switch to a Space with open windows for the application.

Leave Group windows by application on or off based on how you like Mission Control to look. It does not affect the bugs.

Does Reduce Motion Fix Choppy Mission Control Animations?

Yes, for most people it hides the stutter. Reduce Motion replaces the sliding Spaces animation with a short fade, so the dropped frames in the Golden Gate animation no longer show.

1. Open System Settings and click Accessibility.
2. Click Display.
3. Turn on Reduce motion.

Mission Control and desktop switching now fade instead of slide. Some people prefer this even after bugs get fixed, since switching feels faster. If you miss the slide animation, turn the setting off once Apple releases a patch and test again.

Why Did My Mouse Buttons for Mission Control Stop Working?

Your mouse or window utility relies on system behavior macOS 27 changed. Apple's built-in trackpad gestures still work, but tools such as Mac Mouse Fix, BetterTouchTool, SteerMouse, and Logi Options+ need updates written for Golden Gate.

Follow these steps:

1. Quit the utility from its menu bar icon and test Mission Control with your trackpad or Control-Up Arrow. If Mission Control works now, the utility is the cause.
2. Check the developer's website or GitHub page for a macOS 27 update. The Mac Mouse Fix developer posted a temporary build on the project's GitHub page to restore Spaces and Mission Control actions.
3. After updating, open the utility's settings and assign your Mission Control and Spaces actions again, even if they look correct.

As a stopgap, use the keyboard. Control-Up Arrow opens Mission Control, Control-Down Arrow shows the current app's windows, and Control-Left Arrow or Control-Right Arrow moves between desktops.

Why Don't My Mission Control Keyboard Shortcuts Work?

The upgrade sometimes leaves shortcuts listed as enabled while the system ignores them. Turning each one off and on again, or re-entering the key combination, restores them.

1. Open System Settings and click Keyboard.
2. Click Keyboard Shortcuts.
3. Select Mission Control in the list on the left.
4. Make sure the checkboxes next to Mission Control, Application windows, Show Desktop, Move left a space, and Move right a space are on.
5. Uncheck and recheck each one. For any custom shortcut, double-click it and press your key combination again.
6. Click Done.

For trackpad gestures, open System Settings, click Trackpad, then More Gestures, and confirm Mission Control, App Exposé, and Swipe between full-screen applications are set the way you expect.

What If Nothing Fixes Mission Control?

Boot into Safe Mode to rule out login items, then install the next macOS 27 update as soon as it appears. If Mission Control works in Safe Mode, a login item or background app is the cause.

To start in Safe Mode on an Apple silicon Mac (Apple lists the full steps on its Safe Mode support page):

1. Shut down your Mac.
2. Press and hold the power button until Loading startup options appears.
3. Select your startup disk.
4. Hold Shift and click Continue in Safe Mode.

On an Intel Mac, restart and hold Shift until the login window appears.

Test Mission Control in Safe Mode. If it behaves, restart normally, open System Settings, go to General, then Login Items & Extensions, and turn off login items one at a time until you find the culprit.

Also open General, then Software Update, and install any macOS 27.0.x update. Apple ships point releases for new versions within a few weeks, and animation and display bugs of this kind tend to get patched in those first updates. If your Mac also slows down in other places after the upgrade, our guide to Spotlight search problems after a macOS update covers the reindexing slowdown many people see at the same time.

Should You Wait Before Updating to macOS 27?

If you rely on multiple desktops or external monitors for work and have not updated yet, wait for the first point release. Mission Control is where macOS 27 has the most visible bugs right now.

If you have already updated, the fixes above get most Macs back to a usable state today. Start with killall Dock, reset Spaces if desktops stay broken, turn on Reduce Motion to hide the stutter, and update any mouse utility you use for Spaces. For other post-upgrade problems, see our fixes for Wi-Fi dropping after a macOS update and Bluetooth accessories not working at the login screen.