I had the same problem. In my case, I had a triple monitor setup using two different Nvidia cards. There were 2 Samsung Syncmaster 930b monitors and one 2443BWX. One of the 930b monitors only ever had partial window redraw — you could see a window if you were dragging it around the screen, but when you stopped it would go black. The other 930b was fine.
This system was dual boot and ran all three monitors fine on Linux, so that pointed to a Windows driver or config issue. Turns out it was an Nvidia driver update that was needed.


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