Dropping WAN when Wifi Router connected.

[oguruma]

I have had PFsense (2.2.6) running 100% for the last 24 hours. The problem I have is that when I connect my Wifi Router (Netgear WNDR4500) to the network, I lose my WAN connection in the whole house. It is 100% repeatable, and as soon as I disconnect the Wifi Router, I get my WAN back. The PFsense box is 192.168.1.1 and the Wifi Router is 192.168.1.10. DHCP server is turned OFF on the Wifi router, and it is connected as follows:

ISP Modem <> Pfsense Box <> Unmanaged Switch <> Wifi Modem (into LAN port)
All the clients are also connected to the unmanaged switch.

Anybody have any ideas? This is a clean install with the exception of the OpenVPN export client.

Edit: When I lose the WAN, I can still navigate to the GUI, and I can see the external IP, but I cannot check for updates or ping 8.8.8.8