I don't remember changing a whole lot of the music module loader code...
if it is still fed up after deleting see if you can get 8A to work again. if you can't get 8A to work again maybe it has something to do with a recently added song.
if deleting the prefs doesn't work could you send me your itunes XML? i don't know what else it could be. since the only files NBB uses are the itunes XML, its preferences, and the iapps preferences.
you may also try deleting the itunes XML to see if NBB will at least load correctly. if it does then i will need to figure out more of the itunes XML oddities.