I just got a 8 core Mac Pro at work and it has developed a nasty crashing habit. I think that I have narrowed the problem down, but I wanted to see if anyone had any advice. The machine crashes whenever I view a PowerPoint (08) or Keynote (09) file in presentation mode. In the current setup I have the presentation on one screen and my notes and information on the other screen. I am running dual 24 inch LED monitors (not mirrored) and when I disconnnect one of them, there is no crashing and the presentations work great. I have two NVIDIA GeForce GT 120 512 video cards. Any help would be greatly appreciated! Thanks!