Game hangs on preloader

Hi

I'm making some HTML5 games for my school and a couple of them are hanging on the preloader when I try to open them. I've gone into the console for Chrome and Safari and found that they're having a problem with 'AdobeAn' in Chrome and 'AnMovieClip' in Safari. Another version of this game (made with different dimensions) opens fine. Any idea what the problem might be?

Thanks.