If there's anyone here who IS ABLE to render an AVI with Firefly, it would be a great help if you could share your configuration with me. No need to clutter the board - just e-mail me directly with "the usual" (CPU, MHZ, RAM, Video, Opsys, Poser 5 version). If you can include a copy of the uninstal.log file from your Poser dirctory it might help provide a clue, maybe something got missed in my install (three times, and in biggerthom's, and in Zenman's ... ;-)