Clip is not playing correctly
I keep getting these occasional odd glitches where a clip in the timeline suddenly starts playing wrong. In one case, the clip plays correctly, but then suddenly goes smaller in frame, with black around it. There are no effects on it which would do that. It is definitely a glitch. Previously, I fixed it by using the command "delete generated library files" which seems to refresh everything, but it means the entire project has to have it's effects regenerated. Is there a way to fix this one just one small clip when it happens?
iMac, OS X El Capitan (10.11), 3.4 GHz, Fusion drive