Problem! - Flash video stops prematurely

I have this video that I made and converted to an flv for embedding on a site that is being totally dumb. At the end there is a transition from a video clip to an image and every time it gets to that part, the video stops. But I am able to drag the progress bar and finish it out. It just wont keep playing on it’s own. Does that make sense?

It is hard to find info about this anywhere but I am pretty sure it is that image that is doing it. I have tested it on vimeo, youtube, bliptv, and even my own conversion does it.

Let me know if you know of any ways around this or fixes. Thank you!