Yes, I said that in my message, but I also said that it wasn't working for Chrome. It's thoroughly idiotic that it doesn't work with Firefox, it's hardly an obscure browser.
Further happenings: someone was watching a recording on the TV while I was trying to watch one on DA. After they stopped, DA worked again, after logging out and back in. So is this a coincidence, or can you really only watch one recording at a time with the HWS? If this is the case, has it always been this way, or is it something that came along with the thoroughly idiotic Carbon UI? And shouldn't it be documented somewhere? (As you might guess, I rarely use DA.)