Here's my SSID setup, totally basic with as little options set as possible.
Priority tab : defaults
Access Control tab : defaults
Radio Control tab : EVERYTHING enabled, except 'Fast BSS Transition'.
Wireless Client lsolation : check 'Isolate wireless client traffic from other clients on the same AP.'
Sometimes WPA2 has been the only way.
I would also use something like WiFi Explorer (OS X) to make sure the NetGear frequencies (or anything else, for that matter) is not creating interference on the selected Ruckus channels.