gistfile1.txt

$ glxgears
X Error of failed request:  BadWindow (invalid Window parameter)
  Major opcode of failed request:  137 (NV-GLX)
  Minor opcode of failed request:  4 ()
  Resource id in failed request:  0x1a00002
  Serial number of failed request:  38
  Current serial number in output stream:  38


From xorg.log:

[     7.275] (EE) NVIDIA(0): Failed to initialize the GLX module; please check in your X
[     7.275] (EE) NVIDIA(0):     log file that the GLX module has been loaded in your X
[     7.275] (EE) NVIDIA(0):     server, and that the module is the NVIDIA GLX module.  If
[     7.275] (EE) NVIDIA(0):     you continue to encounter problems, Please try
[     7.275] (EE) NVIDIA(0):     reinstalling the NVIDIA driver.

# lsmod | grep nvidia
nvidia              11309216  24