flash site works only when you click play?

Hi Guys,

I have constructed an intro movie sequence, just as a place holder and to do some test etc. that has a preloader that graphically displays the download progress percentage. The trouble is from the web server nothing actually plays until you click 'play' in the Flash controls. Previewed on my local machine things are somewhat different as it works every other time (but not the first) when I click 'simulate download' in bandwidth profiler.

Does anyone know why this might be happening?
I'd be very gratefull for your words of advice!

K