When I try to run freeview on my ubuntu 13 machine, running the nvidia 5.0 cuda drivers, I get the following errors:

Xlib:  extension "NV-GLX" missing on display "localhost:10.0".
Xlib:  extension "NV-GLX" missing on display "localhost:10.0".
Xlib:  extension "NV-GLX" missing on display "localhost:10.0".
Xlib:  extension "NV-GLX" missing on display "localhost:10.0".
X Error: GLXBadContext 150
  Extension:    143 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x8000c0
X Error: GLXBadContext 150
  Extension:    143 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x8000c0
X Error: GLXBadContext 150
  Extension:    143 (Uknown extension)
  Minor opcode: 5 (Unknown request)
  Resource id:  0x8000c0