Hey Jim. What source camera are you shooting with and what codec is it using? Or is it just all types of mixed clips and still images? Sorry, this is high-level, just trying to minimize the variables before I guess. If it’s buggy on certain footage from a certain camera, you may try transcoding the footage and replacing it. If it is in fact just ALL of your source footage, images, animations, video clips, that’s a different story. Let me know!