Correction and update: Frame-by-frame scrubbing of master tape reveals that of 5 frames, frame 4 and 5 are duplicated (identical). I spoke with Cindy at Intersound and she said that this problem has hapened before when the master started with a D5 converted to a Digibeta converted to a DVCAM. She will speak with another client who had the same problem and get back to me.