http://bugs.winehq.org/show_bug.cgi?id=8573
--- Comment #14 from Roderick Colenbrander thunderbird2k@gmx.net 2007-10-05 15:06:55 --- Try WINEDEBUG=+wgl,+opengl wine appname.exe &> log and attach log to this thread.
Perhaps you are suffering from a driver bug.