Hi Ben
the router will still have PVC1 settings, as this is for your general internet connection. PVC2 is specifically for processing the IGMP signals for the TV service and passing them through, so when in the router settings, you will be able to see both PVC1 and PVC2.
Now, lets see about getting this fixed. No network issues or line issues showing, no errors picked up etc, all looks ok. I'll replace the router first, see if it's that, if not we'll tackle the adapters and finally the box itself.
New router on the way, and we can see if this makes a difference.
Karl.