Thanks for the link. Seems I am not the only one with the problem. On my initial search of the D-Link site I did not see that information.
I had dropped back to the 2.00 version of the firmware thinking the firmware upgrade was the problem. 2.10 seemed like I should install because of the specific mention to IOS 6 issues.
What I did not do when reverting to prior firmware was to do a factory reset after installing the firmware. I will try that this evening.
The guest zone not working is not a big deal. But occasionally we do have guests at the house that would like to use the wireless. In late July we are getting an exchange student and i definitely want them on their own network and not have access to the household computers.