Wow, I wonder sometimes why I even bother to look for advise at this site… those answers were uneducated guesses at best, and rude. Very unfair to the community at large looking to “experts” for their answers. Should you not have the solution, why answer??? The correct answer is that some of the support files for FCP were either corrupted, overwritten or just plain deleted. It is possible that either your Leopard install or a subsequent FCP update did this. It’s happened to me and, I had to hunt to find which files were of issue, place or re-place them and all worked fine! The issues I had were that, FCP refused to recognize livetype or motion files and, FCP refused to go into full screen mode for playback. ALL is well now though!!! My guess is that if you have not reinstalled FCS or FCP, the problem is still there, and you have been exporting qt movies :(. Updates most likely will not fix this problem, the files much be physically placed or replaced. In my case it was 5 different files.
Sean Anderson
i.sean.ink@gmail.com