If its any consolation, I've mailed in the change of address form for both my DL and both of my vehicles now THREE times, and I JUST got a renewal notice for one of my cars that was addressed to the first house I lived in while I moved here 3 years ago. I didn't even OWN this vehicle when I lived at that address. The registration for the vehicle even has a different address, yet it was sent there.

Long story short, DMV's SUCK!