Tracking 59.94

I have been unable to get a useable end product out of mocha pro for field-based material (1080i/59.94). I have Track Individual Fields checked on all tracks. After rendering an Insert, the composite TIFF sequence has the “patch” disappearing on random fields. The Layer TIFFs seem to be perfect. The Matte TIFFs seem to be updating only the first fields of each frame.
In Remove, using a clean plate, the “patch” also seems to update only on the first fields.