I recently upgraded my audio system (added the BSW 2.10 sub kit) and now I'm getting the same "Receiver Error" issue as above.

I've tried your trick of deleting the previous locations, along with the address book, just in case, and will wait a couple days to see if it just magically starts working again.

I'll report back with success or failure.

Yeah, failure.

I'll rip the thing apart again now and double check everything, could be just a loose/disconnected antenna (I hope).