Scripts Not working after frame 1

Hi I need a little bit of help. I’m making a prototype game for a Uni project and so far I have setup classes and movie clips for navigation of the menu screens. I have my movie clips all declared in the Document main file and positioned on the Stage. Everything seems to work fine at first but then when I try to go back to the title screen from say the help screen the buttons on the title screen(frame1 BTW) stop working. Any help would be appreciated.