After upgrading my base M1 Air to 26.2, white lines are appearing around edge of the top 1cm of the screen. These lines appear, disappear and shift while moving windows around. It's very distracting, and certainly wasn't showing up on 26.1.
Is anyone else having this issue, and is there some way to get rid of it?
MacBook Air 13″, macOS 26.2
Try booting into Safe Mode then restart normally. Sometimes that will fix anomalies.
Getting the same issue in safe mode too. I've rebooted a few times, and it seems like it's not going away.
I might try reinstalling macOS if nothing else works.
I hate to say it but you might have a hardware problem. The update could judt be a coincedence. Can you post a screen shot?
macOS creenshots don't capture the issue, but an OBS screen recording did. I've saved a frame from the video that shows it. The very top of the screen has a white line along it.
The only thing I see is the light line surrounding any window. Is that what you mean?
This is how it normally looks - no line at the top
I had to go boot my M1 MBA running Tahoe 26.2. I don't see any white line at the top of mine. Maybe someone else will have an idea.
Thanks for your support. I’ll try a reinstall later and if it doesn’t work I’ll get it fixed under AppleCare.
You're welcome. For what it's worth, here's the top of my screen in the Finder…
White lines appear on M1 Air screen after 26.2 upgrade
