Moving windows doesn't re-draw screen properly sometimes

This is the best way I can derscribe what's happening. It started recently, and I've had this Mac Pro (10.6) for several years.  Sometimes, when I move a window, it doesn't redraw the screen *under* it properly, leaving my screen completely messed up. Activating Dashboard (temporarily) fixes it (causes a correct re-draw of everything), and sometimes taking a screengrab fixes it  - the display looks correct underneath the area I am selecting for screengrab. A reboot fixes it also, for a while. Sometimes a Firefox window goes completely black, for some seconds, then comes back; haven't noticed that for any other programs' windows.  I have 4 monitors connected to this Mac and a bunch of internal drives, but everything was very stable until recently. Any idea of how to troubleshoot? Is this a software-level problem or could my video card be going bad or something like that?

This is the iMac forum. If no one answers in awhile you could try over in the Mac Pro forum https://discussions.apple.com/community/desktop_computers/mac_pro

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