I think this one "broke" with a firmware upgrade that blew out the config settings leaving it in default "router" mode instead of clear bridging.

Good to hear you had better luck with support though. With Rogers and Bell here, you usually start with "could I be transfered to the canadian call centre please" then hope they can help.

(Bad connetions and heavy accents rather than assumptions if incompetance on that request for transfer; if anyone's curious.)