All of my home movie file names start with a number. The oldest is number one, the most recent is 27. Mezzmo seems to rename them arbitrarily. It retains some ID numbers, buries others inside the file name, and, in one case, completely lost movie number 27. It appears in the recently-added list, but not in the list of all movies.

Needless to say, the sequence of these movies is very important to me. They also happen to have been copied from iTunes to a special directory in the order of their creation date (not necessarily the date they came into my possession.) I cannot explain why they got screwed up by Messmo. There was no change in the actual files names on my PC.