I'm having the same problem
I am trying to get a quicktime movie into imovie, and it crashes every single time I try. It is a movie clip taken in photobooth and I would like to put it into imovie to add sound and things. I just reinstalled he latest version of imovie, although I'm sure I was up to date anyway. I am getting incredibly frustrated. After I hit import, it will act like it is going to import the movie, but then stops suddenly and I have to restart the program. Other movies go in just fine, but not this one. Does anyone know why this is happening, or how I can make this work? I want to throw my MacBook out of the window, and go back to a PC! Any help would be greatly appreciated. It doesn't seem like it should be this hard, drag or import the movie into imove, edit, play and have fun.