Thanks cluberti. I should also note that I haven't seen any other sort of graphics corruption anywhere else. I'm leaning towards a driver issue, but part of the problem is I've also been unable to consistently reproduce the error, making it difficult to pinpoint it on something specific or a specific series of events. Even if a driver update was to fix it, I have no way of knowing either way unless it was to pop up again days or weeks down the road. To maybe help rule out the hardware issue, does a memtest86 (or similar) for video cards exist?