http://bugs.winehq.org/show_bug.cgi?id=30328
--- Comment #4 from Matteo Bruni matteo.mystral@gmail.com 2012-04-03 10:17:01 CDT --- (In reply to comment #3)
It does sound somewhat similar to bug 30269, any chance they're related?
Your hack from bug 30269 "fixes" this too, so they are related somewhat. Although your patch touches stuff when uploading to GL while mine hacks the download path. Puzzling to say the least... But I guess this enforces the notion of a driver bug.