Tom,
When you initially recued the tape did you use the “END SEARCH” button on the DVX. This would have cued to the very last frame on the tape. If i do continue on a tape after reloading it then I always take the time to recue with this feature.
The only thing I can think of is that you did not do this and the footage is somewhere a few seconds past where you thought it might have started recording.
It seems strange. The only other thing is that the tape was fully rewound and then it was recorded over. OR maybe you had the record tab in and it never recorded the second shoot.
Take a deep breath and think things through.
David
Peace and Love 🙂