I've seen this problem running certain decks off the AES output on my Mini-Me.
that's because the aes on the minime is pro.... only pro decks can be run in that chain (p1's, hhb's, d10's, m1's).
yes, I just had this happen last night...so I fed a P1 first then went out of P1>D7 and still copy prohibit....guess the P1 passes AES signal.
my d8 was never able to get a signal from a p1. oh well.
maybe you were feeding the P1 an AES signal
I have patched out of P1 w/ D7 prior....it must have been s/pdif
jah