I have a new Macbook Pro Retina display loaded and has been running Premiere CS6 great. I have some previously made, heavily edited sequences that are rendering fine. I just loaded new cuts from the same camera I have been using and the new sequences are not rendering. I get audio and choppy, occasion stills for video. I have tried this on several videos taken on different days. I feel that my settings are not correct although they have not changed to my knowledge. Any ideas?