That is really odd that only your system was affected by the update in regards to the HIC, since others aren't having the same problems. Have you tried rebooting your modem/router and rerunning the connection tests?
Several times, with 2 different routers, with and without the HIC. The problem is that after a reset or a network reset one Hopper will see the other Hopper for a minute or so but will not play any recordings and the other Hopper will disappear. The Joeys only show the Hopper they are linked to. The network connections are fine - all 4 boxes have internet connectivity and On Demand works ok either with the HIC or with a bridged Hopper hard wired to the router. The system has been solid prior to this update.