Made a 30 sec QT movie and a 6 min QT movie. My Mac isn't internet connected so I save onto a flashdrive and load into my pc laptop which I use 90% of the time and Mac only for FCP. Longer QT transferred fine and loaded into YouTube, 30 sec QT is recognizable in Flashdrive on Mac, but not on same Flash on PC. Both done the same way. Not sure why one works and one doesn't. I did two more a week ago, different files and they both worked on PC.