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I have a Mac Pro with 4 monitors; I've been using it for a couple of years now, with no problem. Over the last few months, I've noticed that after a while, screen redraws (like after I move a window) get completely messed up. Remarkably, this is visible to screengrab, so you can see what it looks like here: url...it's worst on one of the monitors, but does happen on one of the others.Usually going to Dashboard and back clears it up, but not always.Also, a weird thing affects Firefox - the window contents go completely black sometimes. Sometimes moving it to a different monitor makes it show up again, and sometimes not.I've had one of the video cards replaced (the one running the monitors where this happens most often) but it's still happening. And it's not consistent enough so that if I taker the machine to Apple, they'd have to work on it for weeks maybe to see this behavior.  [code]


Info:
Intel Mac Pro, Mac OS X (10.6.7)

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