I had the same problem with animation I was doing with posette dancing in front of a mirror. I never did get the damn thing rendered totally in P5 until I turned off the reflections and change the material on the wall to just a standard simple wall texture. I tried it on both of my machines and I would always get to about frame 150 and P5 would lock up. Funny thing is that the thing rendered better on my laptop and it has a whole lot less horsepower than my desktop. Most of the time I had to cold boot the machine to get out of it. I tried changing the buck size... went all the way down to 4 changed the anti-alias settings, turned the rays down to 2 and it still wouldn't go any farther than frame 150. I finally got the thing rendered by taking the pz3 back into PPP and removing the walls and floor then imported it into C4D and setting it up there. It was the last time I tried an animation in P5. I gone back to PPP and importing in C4D to render. I haven't had nearly as many headaches or temper tantrums. I'm sure my neighbors are appreciate it.:) Ed