Black rectangles on screen
I'm upgrading to 1.6 and am noticing repainting glitches on some machines > some areas on the screen turn black and might or might not repaint correctly when forcing a repaint through resizing.
Phenomenon is erratic with random times in between; to be honest I'm not even sure it came with 1.6
Seen this on a few XP pro machines, one of which is my laptop with an ATI mobility graphics card.
Any ideas to get rid of this, possible causes, hints?