Hm, good point. I had a graphic-corruption problem on another box (with an olllld Cirrus SVGA card), and found that setting "no_bitblt" in the XF86Config fixed the problem. There are a bunch of other acceleration-related tweaks you could make to XF86Config.
I may have to look into this further myself

OpenOffice is just about the only app that does it, but come to think of it, I get other minor problems in other progs as well. LyX has trouble refreshing when it has been resized (easily fixed by min-max), and Mozilla and Phoenix occasionally have problems redrawing stuff. Also my Gtk widgets sometimes take a little longer than they ought to to display correctly after being hidden...