Problems with WN2000RPTv2 and EX61000 not connecting without login

I have a home/work network using a CISCO DPQ3925-X Router connected via Cable to Optus in Australia.

Until recently I was happily using the WN2000RPTv2 Range Extender to provide WiFi coverage at the back of the house.  Unfortunately the WN2000RPTv2 started showing a red link light so I decided to upgrade to the EX6100.  This is when the trouble started.

I connected the EX6100 to my laptop via ethernet and went through the genie.  On completion any device that I use to try to connect to the new Wireless SSID is redirected to the mywiext.com site and the Netgear genie with an additional message saying I must log in to connect to the internet.

When that happened with the EX6100 I decided to still use the WN2000RPTv2 but position it closer to the Router, and use the EX6100 at the other end of the house connected to the EX6100.  That was when I discovered that the WN2000RPTv2  had also somehow been reconfigured and was also now giving any connecting user the redirect to mywiext.com.

The genie also fails to recognise the Router's SSID even though other devices can see and connect to it, so I have to do a manual config.

The CISCO Router is set to use WPA or WPA2, with TKIP and AES encription.  I am wary of changing these settings, particularly as the WN2000RPTv2 was working until I tried to configure the EX6100.

Any assistance would be appreciated.