Thanks for sticking with me on this. It happens with all codecs and even when no changes are being made to the video. I don't think I've tried uncompressed video, but I will. I have gone back to Poser 4 for my animation project, and there are no problems with the avi output. Any more ideas? I'd love to get this problem resolved, so I can work in just one version of Poser and not have to keep going back and forth just to do the animation part. Thanks again.