I've tried Logic 9.1.5, and 9.1.3 and the same thing on my machine. I've also trashed my preferences. As soon as I go to File>Open Movie Logic will kind of flash, as if I hit a button on the keyboard it doesn't like, and then it just shuts down. It doesn't even bring up a dialogue to allow me to navigate to a movie, so it's not a codec thing. It just instantly crashes the moment I use the 'open Movie' function. Any ideas of things to try?