Description of problem:
When quitting an certain games, (I think it's related to OpenGL) a X crashes and
therefore terminates the session.

Version-Release number of selected component (if applicable):
xorg-x11-server-Xorg-1.1.1-16.fc6
mesa-libGL-6.5-20.fc6
mesa-libGLU-6.5-20.fc6
freeglut-2.4.0-9.fc6

How reproducible:
Always

Steps to Reproduce:
1. Start a OpenGL program like GL-117, SuperTux, or BZFlag.
2. Change resolution settings (not absolutely needed, but works best to make the
bug)
3. Restart the game either by having do it for you (the case of SuperTux) or by
clicking 'Exit'. On my computer, X crashes here and I don't get a change to
start the game again as the session was terminated.
  
Actual results:
X crashes, Gnome /KDE session terminated

Expected results:
X doesn't crash

Additional info:
I'm on a 64MB nVidia card, but using the 'nv' driver.