Hi Dave,
I’m having the same issues. In my shot, I am zooming out of a picture to start the scene and panning away from the picture at the end of the scene. Mocha is able to track the picture as the camera pans away but the tracker goes out of whack when zooming out to start the scene. I’ve tried tracking backwards and to transcode the clip using the ProRes422 codec as you’ve suggested but I’m still having the same issues. Do I need to manually adjust the tracker frame by frame?