Thanks for sharing sfax
Did you try media monkey at all, for your music collection?
I do not have the problem below with my M3. Annoying that it's now present in new cars.
I've noticed another bug that seems to affect USB and HDD music (maybe iPod too but not sure) and that is where you have an album split over 2 or more CDs. Search by album and play and it plays CD1 track 1 then CD2 track 1, CD1Tr2, CD2Tr2 etc. Doh!