Weird dynamic textfield rendering problem - HELP!

I have a flash file that loads dynamic text from a text file. When you press the space bar, it animates the text upward like movie credits. It works fine until I add more than 50 lines or so, at which point it delays showing the text until it’s well into its scrolling.

the kink here is that it only displays this error when it plays in fullscreen mode (which it is set to do by default, and what I need). if I escape out to window mode, it plays the text animation just fine.

Does anyone know how I can work around this glitch? I’m in a panic because I’m on show sit and need this working tonight!!