Flash video player rendering problem

Hi, I have a custom Flash video player written in AS3.  While it is working fine, there is some issue when we test it in certain browsers, specifically IE on PC and FireFox on the mac.  Basically the movie seems to stop rendering at a few of the buttons and won't load the video, although in other browsers it all works fine, so we know these resources are available.  The movie is run mainly by a document class and one other class.  The Fla consists of 4 frames, the first of which is a simple preloader,   Can anyone think of anything that might be a cause?
Many thanks
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not a buffering issue?
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