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Does anyone know how to get rid of this black box on the top right-hand corner? If I restart my computer it disappears but reappears a couple of hours later. Also, it doesn't always appear on all desktops. For example, if it appears on desktop 1 it doesn't appear on desktop 2.
MacBook
Startup in safe mode to try to isolate the cause of the issue.
To leave Safe Mode, click Apple logo in the menu bar and choose “Restart”.
Test.
Startup in safe mode to try to isolate the cause of the issue.
To leave Safe Mode, click Apple logo in the menu bar and choose “Restart”.
Test.
Weird Black box
