Problem editing MC in button state

[bobgodwin]

I've encountered a strange problem when editing the movieclip in button states. After going to the state, then going to frames, after returning to the main movie, the frame selector disappears and the movie gets a script error if I try to play it in the browser. Only if I stop the preloader will the movie play, but the frame selector's still gone. I've included a striped dpwn .fun file if someone would like to take a look. This has happened with several of my .fun files.