Yeah, had it turned off for some hours now, and just tried turning it on, to no avail.. Still says the database isn't initialized. When I try to initialize, it says "..501 found..." - what exactly is this number? If it's the number of tracks, it's way off, as there's around 2700 tracks on my card.
Weird. Never had any problems with the database in Rockbox. Seems like it gets stuck somewhere. Did you select the right directories (mnt/sdcard, mnt/external_sd, mnt/usb_storage) in the database settings? If so, I'd suggest removing everything but sound and artwork files and try to scan again.