ZyXel Gateway Configuration Save

I use the ZyXel SBG 3300 as my Intenet VPN  Router.  Everything works well except one feature.  I have to disable NIS 2014 Smart FW in order to save the Router Config. file.  I have the Router in the network TRUST Zone (using MAC) and it shows on the network list.  However I still have to disable NIS to save my config. files.

Hoping this has been resolved by someone!

Thanks jeffjohn