[Terry Mikkelsen] “I have never “export” a string of MPEGs from DVDSP to make a single file”
That is because there is no such feature within DVDSP. Using multiple m2v assets in a single video stream has always been a problem. There is a program (Mpeg Amend) that can stitch these files together give you a valid single video. It is not a valid workflow if you want playback compatibility.
I agree that her problem is probably the video stream but more than likely it is a spike in the bitrate which cannot be seen in a player, and this could be a combo of the file and the media. It could also be she has a command placed in a chapter marker. It can be several things