http://bugs.winehq.org/show_bug.cgi?id=7632
------- Additional Comments From l_bratch@yahoo.co.uk 2007-04-03 17:22 ------- Yup that's it, that makes it playable (disabling GLSL, and using /novalidate).
I can confirm that I get the same problem, although strangely it's only in Skirmish mode.