http://bugs.winehq.org/show_bug.cgi?id=4966
--- Comment #7 from Roderick Colenbrander thunderbird2k@gmx.net 2007-10-03 10:49:00 --- Please retest using the latest Wine git version. OpenGL child window rendering should be working now. Note that it might not work correctly on all drivers (due to driver bugs) on Nvidia hardware it should work for sure.