Alright, I recreated the error! Here’s exactly what I did. I had two clips sitting on top of each other. I selected one clip, went to ‘Modify timecode’, selected ‘First frame’, deselected Source TC, selected Aux TC 1, and changed the first frame to 00:00:00:00. No problems there. I then went to the other clip and did exactly the same thing. As soon as I hit ok, a general error popped up (no number), and voila! My 60 GB clip has shrunk to 1.78 GB.
Am I doing something terribly wrong here? Or is something just messed up?