[CentOS] pymol

Anyone familiar with pymol?

We're getting an error I find references to from a few years ago when we
try to run remotely on a headless server. I can run it fine on my machine
(CentOS 6.3, NVidia video), and on another person's workstation remotely,
with other make video, but the server's got a Matrox - which shouldn't
matter, since I'm running this after ssh -Y. pymol yum installed fine, no
problems.

I found, and did a export LIBGL_ALWAYS_INDIRECT=1, which allowed glxgears
to work, albeit slowly and unevenly, but pymol always gives me
freeglut (pymol):  ERROR:  Internal error <FBConfig with necessary
capabilities not found> in function fgOpenWindow
X Error of failed request:  BadWindow (invalid Window parameter)
  Major opcode of failed request:  4 (X_DestroyWindow)
  Resource id in failed request:  0x0
  Serial number of failed request:  24
  Current serial number in output stream:  27
 PyMOL: abrupt program termination.

I read that this is two errors, not one, but other than the environment
variable, can't find any other fix.

Anyone?

        mark