Have you emailed hmann about your problem? I'm curious because I my CPU runs below the minimum requriements and I haven't had a problem so far. Though my RAM far exceeds the minimums. Does it lock up when it is preparing the shadow map or does it actually start rendering on the screen and then locks up? I had a huge problem not to long ago that invovled too many objects and too many lights causeing Poser to lock up when it was creating the shadow maps. I actually had to make two seperat files each with one half of the scene and shoot my shots that way.