Problem getting animation to work in slide presentation

I’ve created a flash slide presentation with animation on most of the slides but the problem is when I play the presentation it only runs the animation once. If I move to the next slide & go back it just takes me to the final frame in the animation without playing it.

Any ideas how I can get round this?
I want to set it up so that a slide’s animation plays every time you view the slide, regardless if you’ve viewed it before.

Any suggestions most welcome.

Cheers.