I looked at the fla, spent a couple hours on it last night. You have gone about this all wrong. You have graphic symbols, groups, movie clips all mixed up. The only thing that was almost right is the intro movie clip.

You should build everything on it's own layer, inside the page movie clips. Flowers on their own layer, clouds, all objects on a layer of their own. Layers are free, use them. And don't use graphic symbols, forget they are there, everything should be a movie clip or a button.

I still don't know why it stops early though, there are too many things not right.