Odd sudden behavor, anyone got ideas?

ok i ahve a long flash movie of several frames. each button press in each frame will send the user to another frame (its basicly a user interface)

Now it was working fine now suddenly i go to the first frame which is a login. it sucessfully executes the PHP and SQL databse interogation of the user name and password and sucessfully jumps to the first frame of the user interface. now at this poit is i click any of the buttons each of which goes to a diffrent frame, it brefly flicks to that page then back again. its amlost like they dont have a stop fucntion, but they do. Any ideas?