Imported clip won't play, Mocha Pro 5.5.0 AE plugin

I have a good track that I created using a still image imported onto my planar surface. When I import a 98-frame clip (.mov) to use in place of the still image, the clip only shows the last frame of the clip and won’t play at all. When I try to delete the MOV clip, the app crashes. I even tried setting TC on the clip to match the TC of the shot I’m tracking. What am I doing wrong? Thanks.