So, a couple weeks ago I got a Roamio Pro to replace my XL4. I popped the CC out of the XL4, put it in the Roamio. I chatted FiOS support to re-pair it (which is only required for premiums) and 10 minutes later all was fine.
Tonight, I tried to watch HBO and "not authorized"... no premiums working... 30 min with support plus a reboot and hard powercycle and it's still not working.
Inbetween the two events I had briefly stuck the CC back into the XL4, did that screw it up?
Argh - I only did that because I was trying to do a factory reset on the XL4, but that was completely impossible because it kept bringing up the "no cablecard" screen when I was trying to use the menus.