MacBook Air M3 Notification Center freezes with Mail on macOS 27.0.1

Troubleshooting: Notification Center freezes on MacBook Air M3 (macOS 27.0.1)

Since the issue started with macOS 27.0.1 and did not occur in macOS 26.7.2, it may be an operating-system regression involving Mail notifications and Notification Center.

1. Isolate the problem

Go to System Settings >> Notifications >> Mail and temporarily disable Mail notifications. Test notifications from other apps, then re-enable Mail and try expanding different messages.

If only Mail notifications trigger the freeze, the issue may be related to how they are handled or displayed.

2. Update macOS and test in Safe Mode

Check System Settings >> General >> Software Update for a newer compatible release. Back up your Mac before installing an update.

Apple's instructions: Update macOS on Mac.

If the issue persists, start your MacBook Air M3 in Safe Mode:

1. Shut down your Mac using Apple menu  >> Shut Down and wait for the screen to turn off.
2. Press and hold the power button (Touch ID button) until Loading startup options appears.
3. Select your usual startup disk, typically Macintosh HD.
4. Hold the Shift key and click Continue in Safe Mode.
5. Log in and test whether expanding a Mail notification still freezes Notification Center.

To exit Safe Mode, restart your Mac normally using Apple menu  >> Restart.

Apple's instructions: Start up your Mac in safe mode.

If the issue disappears in Safe Mode, third-party software or startup items may be contributing to the problem. If it persists, a macOS or built-in app issue becomes more likely.

3. Restart Notification Centre and collect diagnostics

If Notification Centre freezes, open Activity Monitor, find the Notification Centre process, and force quit it. This is a temporary workaround.

If the problem continues, use Activity Monitor to capture a process sample or a system diagnostics report. You can then check Console for errors involving Mail or Notification Center around the time of the freeze.

Apple's instructions:

• Run system diagnostics in Activity Monitor
• Find log messages in Console

Avoid deleting Mail data or reinstalling macOS until the cause is better understood.

Key question: Does the freeze happen with every Mail notification or only with certain emails? This will help narrow down the cause.

To fix the Notification Center freeze when expanding Mail alerts on macOS 27.0.1, change your Mail notification style from "Alerts" to "Banners" in System Settings, or restart the Notification Center process via Activity Monitor.

How to Change Mail Notification Style

• Open System Settings from the Apple menu.
• Click Notifications in the side panel.
• Select Mail from the list of apps.
• Change the alert style from Alerts (which require clicking the expand arrow) to Banners (which auto-dismiss) or turn off preview expansion.

How to Restart Notification Center

• Press Command + Space to open Spotlight, type Activity Monitor, and press Enter.
• Type Notification Center into the top-right search box.
• Click on Notification Center, then click the Stop (X) button in the toolbar.
• Choose Force Quit to restart the process safely

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

If the above does not work, then see if the problem is present when you boot in safe mode. That process performs some system cleanup and clears caches, andalso disables 3rd party extensions that may cause problems.

Start up your Mac in safe mode - Apple Support

If that does not correct the issue, test in a new user account. A newly-created user account will have all settings at default, and if the issue does not occur in that new account then it provides guidance on what may need to be changed to correct the issue.

Add a user or group on Mac - Apple Support

Once the testing is complete, the new account can easily be deleted.

Delete a user or group on Mac – Apple Support

Those steps will help to isolate the problem.