FLV Video Problem - Please Help!

Hi

We're making a swf interface that plays different movie clips. We're using video encoded in On2VP6 with the flash video encoder, and using the standard media controller in flash.

When the clip has finished, it is meant to close, and return to the interface. It does this perfectly for nearly all the clips, except a few. So here's the problem:

With some clips, when they get to the end (or close to the end), they just stop. Nothing happens at all.

Has anyone had this problem? Any known fixes? We're a bit baffled, so any help would begreatly appreciated!

many thanks,
Xale