http://bugs.winehq.org/show_bug.cgi?id=11231
--- Comment #6 from Alexander Dorofeyev alexd4@inbox.lv 2008-01-18 07:09:22 --- Jorg, there was a discussion of mesa drivers recently on #winehackers and Stefan Dosinger said random memory corruption happens with several mesa drivers. So this can explain issues with 3d games and tests like yours.
Do you use DirectDrawRenderer=opengl registry setting? This would explain problems in 2D only apps.