Also, Keeping an eye on the processors via activity monitor, I noticed that every time I select an edit in the multicam clip all but one processor stops funtioning and that one runs up to 100%. This only hapens while editing this one particular project. All other projects work fine. The stall lasts about 10 seconds but only the video freezes, the audio continues to play on.
Any sugestions, or ideas of things to try. Open to anything.