I'm testing XMM since two weeks and think that this is my software to order my videos.
But sometimes, when I click on the 'Save-Button' the last modified film will be copied in older datasets. So I looked in the mdb-file and see, that all IDs were there but all filled with the last modified film.
Have you see any error message when you have thsi problem? because is strange that XMM replace movies with others (was a old bug, solved some months ago).