http://bugs.winehq.org/show_bug.cgi?id=27526
--- Comment #1 from Michael Abbott michael@araneidae.co.uk 2011-06-18 12:30:54 CDT --- This bug occurs in OpenGL mode (with an nVidia graphics driver), but not if the Half Life video mode is set to Software. Interestingly, Software mode exposes another bug, #27528.