I am starting work on an iMovie project, and I'm anticipating having to go back and forth between the iMovie HD applications in iLife '05 on one computer and '06 on another one. I don't plan on doing lots of advanced version-specific effects; the only semi-irregular feature I'll be using is the Ken Burns effect. That being said, will I have any problems going between those two versions? What things, if any, won't work? Have you had any experiences doing this?