http://bugs.winehq.org/show_bug.cgi?id=11203
--- Comment #7 from Stefan Dösinger stefandoesinger@gmx.at 2008-01-15 16:48:43 --- What card do you have? Does it use a 32 bit framebuffer(at depth 24), or a 24 bit framebuffer?
what happens if you replace the screen_bpp = 32; line with screen_bpp = 24; ?