Thanks for your reply. That was the first thing I did and we are working on it but I hoped that maybe somebody else had encountered this problem and knew how to deal with it. If it's a bug, it's hard to believe that I'm the only one who has encountered it, but I've had no other trouble with my setup. I did replace the graphics card yesterday but called their tech support today and spent a good deal of time today reviewing the installation, and changed some settings but that did not affect this rendering problem at all.