@SourceChild - Looking at your profile there are a number of movies where the movie timescale and duration and the quicktime timescale duration are different. Catalyst gets really grumpy when this happens. Where I have tended to see this in the past is where people have tried to fudge frame rate conversion between NTSC and PAL or vice versa without doing it properly. I'm not suggesting you have done this, but your movie and quicktime's own timescale/durations are not the same.

Richard wrote a thingy about reconforming movies to fix this problem some time ago.

You'll find it here.
http://samsc.com/showthread.php?t=14...ight=timescale
Hope this helps.

Hugh