Pinicle StudioUltimate12.1 Picture in Picture

I have successfully produced several dvd’s using Picture in Picture. suddenly my last production although presenting correctly in preview mode (editing) when burnt to DVD the screen goes bright green on viewing when Picture in Picture points in video are reached. I have tried several players with same result. Any one any suggestions as to where I may have gone wrong?
Pinicle has not been upgraded since my last production.

You aren’t getting answers in the Newbie forum, and I’m not a Pinnacle user, so I’m going to move your thread to the Video Editing forum in hopes someone more familiar with the program will respond.