Error Message: Display Error

On STC, only the bar at the bottom of the screen where the scale, crop region, etc. can be changed on the fly goes black and I get an error message that a display error has occurred. Doesn't happen for local saves. Always happens during the updating and/or regenerating phase after loading central is completed.

Haven't had this on my laptop, only on my desktop which is running

Pentium(R) 4, 2.8GHz
2 GB RAM
Nvidia Quadro FX 500, acceleration ull, no open GL
Revit 8.1

Anyone had similar experience? Ideas?

Thanks in advance....