Call NAD support. They can't fix it if they don't know about it. Check in the HDTV hardware forum also. For some reason various cable and sat stbs have issues handshaking with some audio/video processors. Ask some Anthem D2 owners. Many changes to the D2 firmware have dealt with HDMI handshaking with some pesky stbs.
And the pantaloon duck, white gooseneck quacked: Webcor, Webcor