So, I've been using my PowerBook to do some video editing and creation at work with iMovie. Now my hard drive is filling up, so I thought I would move some of the older projects to a PC with a 150GB hard drive via the network. To make sure it would work I copied an entire project to the PC, then back. Once I did that iMovie no longer recognized the project file and the clips could not be imported into a new project. So what do I need to do to get this to work?