As the title says, When I try to play some episodes that previously worked (I havent played them for a year or so) they fail to open in Quicktime X (with perian 1.2 installed) When I open the files in VLC they play as an mp3 would and I can hear tracks from my library that I recognise... Anyone encountered this before? PS: my music and video libraries are on different physical disks and the videos are not in iTunes. If it helps I could post a sample file on my web server for people to download and test? The one i would use is an episode of Robot Chicken, but I have at least 100 episodes doing this thing, although not all of my collection.