If you're using Poser 5, you may inadvertently have motion blur turned on and set way high. Otherwise, what saxon said - the wrong codec. (DivX, etc.) http://www.jmcgowan.com/avicodecs.html http://www.compressionworks.com/codecs.htm http://www.adobe.com/support/techguides/premiere/prmr_codecs/page4.html ...and a million other codec sites...hope this helps!