AC68P - devices won't connect to Guest Networks, but work fine in the non-Guest ones...what gives?

[sherv]

About a month ago, every time a device tries to connect to my guest networks (both 2.4 and 5 ghz), it simply sits there and spins and doesn't connect:

I've tried updating to the latest firmware, resetting to factory defaults and settting up again, etc, and nothing seems to work.... what's strange is that same devices will connect to my non-guest networks fine, so it's obviously not a hardware (RF or Antenna) issue, but something else. Here is my setup:

Any help would be greatly appreciated.

 

[sherv]

I forgot to mention that one wierd thing I notice is that the connection icon at the top right always shows the "guest network" being connected, which is wierd since it is not the one that is actually working!