I just had the exact same problem in P5 running XP,1.5g ram,1.6mhz. Mine had 5 figures and 7 spotlights. I increased the VM to the max and it didn't work. I think the demands placed on Poser with certain complex works may be taxing a video cards capabilities. For myself, I am going to try upgrading my video card to the new ATI 9700 pro and see if that will solve my hang up problem.