I've noticed a couple of times after a reboot that a hub sometimes will briefly show a Zigbee offline message. It seems to clear up though. Today at my clients on a C-7 I did a shutdown, pull plug, restart after funky z-wave inclusion and when it came back up the zigbee went offline, no devices etc - I don't HAVE any zigbee devices on that hub yet. I got it back by going to the Zigbee details page and bringing it offline then putting it back online again. This seemed to work okay. I did end up rebooting a bit later and everything was fine.
funky 
