http://bugs.winehq.org/show_bug.cgi?id=20380
--- Comment #33 from Roderick Colenbrander thunderbird2k@gmail.com 2009-10-28 13:29:07 --- I haven't had time to look at the issue and neither have I seen the issue on this system, so I can only assist a bit from the sidelines. I would recommend to look at winex11.drv/dib.c and perhaps the xrender code but I think that the xrender code itself is correct. What the code roughly does is check what color depths are available when a DIBSection is created and later on, xrender is used for blitting and font drawing. I think the issue is somewhere in the dib code.
You could try to run the game in synchronous X11 mode, issues can be easier to debug in there. If you use WINEDEBUG=+synchronous you use this mode, it can be combined with the other debug channels as well. Hopefully it helps debugging but usage of it might also 'fix' the issue.
Roderick