McDave, note that superstar is using N800 Video Convert, which is not the same as NITVC.

I also use N800 Video Convert and DVD Shrink and have no problems. I recommend you let DVDShrink make files with no size limitation (see your preferences for that option) -- that results in the whole movie being in a single VOB file, readily recognized since it's the largest. Once you have NVC open, just open the single VOB file, add it and encode.