Thanks. I am using 6 IAP-105 with just the built-in Virtual Controller running 6.1.2... I was having issues with iPads and iPhones on Guest networks using the 6.1.3 firmware and was advised to downgrade to 6.1.2. I guess I have traded flakey iOS device connections for printer issues.
If I run everything on "Employee" configured networks, everything works fine. I had hoped to use "Guest" networks to segregate non-domain devices like employee owned smartphones and tablets.
Guess I will wait to see what the next firmware release brings. :(