Actually, I discovered the issue. As I investigated I discovered that the footage seemed to be dropping frames randomly, sometimes the 7th frame, sometimes the 4th frame, it was never consistent. Turns out both cameras and the audio were being fed timecode from a lockbox, and I am now certain that the lockbox was spitting out bad timecode. The only solution I’ve come up with is to create all new masters with correct timecode now. I did a test Export and it worked when I brought it into the system (the timecode was fine). But now I have to create new masters and wondering what codec to use to export new quicktime masters. Any ideas? (This is originally C300 footage)