http://bugs.winehq.org/show_bug.cgi?id=21847
--- Comment #6 from johnnyuk@hotmail.com johnnyuk@hotmail.com 2010-02-25 06:28:28 --- Found a temporary fix for anyone who's interested - simply marking steam.exe to start in Windows 7 compatibility mode allows it to render without a problem. Running here on karmic x86, wine 1.1.39, no problems so far.