After installing Panther ,I turned on file vault, and tried to capture some video both in iMovie and Final Cut Express, and it would capture for about 1 second and then quit. After turning off file vault and trying again I had no problem. Just a little tip, that if your capturing video to your home directory I would shut off file vault or save it on a separate drive or at least not in your home directory.I have to say iMovie is still a little sluggish in Panther. Otherwise this is a great OS. Expose alone was worth the price of the upgrade.