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irock101

macrumors 6502
Original poster
Jul 26, 2011
350
59
Hey,

I am using an external monitor with my 2011 macbook air. Sometimes when i move a window 'stamp' of the window in form of a black box will stay on the screen. It gets pretty annoying through out the day so i have to change my background picture or restart to remove the black boxes.
Is there anything i can do?
 
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