"I suppose if it did crash, it creates an AVI to that point and I could start from that frame to a new AVI file and there must be a shareware prog to combine AVI movies." if I'm reading this right, it can't be done. When a render crashes while ouputting to avi, the file will be corrupted. Not a program out there that can "fix" it to my knowledge. BMP sequences is the way to go next time, just a fail proof way of making sure your renders will get done :-) p.s. great movie! very impressive use of HDRI. Is the choppiness of the movie due to the framerate, compressor or is it just on my end?