Thorne;
I hate to see you sitting out there, waiting for an answer. Hopefully, this will be of help.
I purchased my Beoport when the units first came out, and it would sometimes do this. Or split an album into two, describing the second half as unknown. I found that by clicking the N.MUSIC white drive selection box in SCAN, rather than let it go on autoscan (Orange colour), I could avoid this from reoccurring.
A the same time, where I had no video clip files before, now I can watch those, one after another, non-stop.
As the update versions have increased over the years, the problems appear to have stopped. It is possible that trying RECONFIG, or even to delete the program itself and the download and reinstall may solve the problem you are experiencing.
I'm on holiday at the moment, but will be building another " 5 year PC " when I return with more HD, B-R/DVD, memory, and speed, etc. I have a great number of albums loaded, and have to back-up onto external HD or lose it. I'm thinking about what effect ( hopefully none ) the new system may have on the Beoport,