I was editing this elaborate chase scene, and it was going really well. Then I went back earlier in the sequence to work with some new footage. When I viewed the old part of the scene (the part that comes second), something weird had happened:
In the timeline, all of the clips look normal. When I double click on one of the clips, it comes up in the viewer looking completely normal. However, when I play it in the canvas there are these weird repeating frames in the clips. They occur at seemingly random times throughout the timeline. It feels like a bug or something. When I export the video to Quicktime, they're still there.
I forgot my laptop and camera, but I'll say what kind of processor it is and what kind of camera tomorrow when I retrieve it.
Also, at around the same time as I discovered this problem, I discovered this problem. I have no idea if they are related.