AC3100 - Chromecasts won't connect

Hi all,

I recently upgraded my network from my workhouse N66U to an AC3100. I have four chromecasts in house - three regular and one ultra. None of them can now connect to my wifi networks. The older ones cant connect to the 2.4GHz network SSID and the new ultra (5ghz equipped) cannot connect to the 5ghz network SSID.

It sees it fine in the setup, but just sits there waiting for the network and eventually times out.

Any suggestions? I have the default settings loaded, wondering if I...

AC3100 - Chromecasts won't connect