http://bugs.winehq.org/show_bug.cgi?id=4243
--- Comment #7 from Jesse Allen the3dfxdude@gmail.com 2007-08-12 14:32:29 --- (In reply to comment #5)
Various people have suggested that this is a WoW bug. E.g. when you move the mouse under a certain angle that textures disappear so now and then. If that's not the issue you were most likely suffering from a driver bug.
That sounds like a bug I've seen in Mesa & War3 (and also reportibly WoW). fglrx may have had the same problem. We had a bug report in Mesa for a long time and I know DRI has been fixed in the last 6 months. I suspect this was a driver problem.