http://bugs.winehq.org/show_bug.cgi?id=14689
--- Comment #8 from Roderick Colenbrander thunderbird2k@gmx.net 2008-08-12 07:40:26 --- This is a known issue (the direct rendering one). Most likely the drivers are running out of virtual memory (we only leave a few hundred MB for normal libraries). The nvidia drivers seem to be more tolerant to this. The real solution is to override the memory functions of libGL.so and forward those to win32 calls, so the drivers can use win32 memory of which we have enough. There is nothing else that can be done about it (except for using a memory hack which is attached to some other bug report).