I had two SSID's on a Zonedirector unit with 6 AP's (set up by someone else). I created a new SSID and forced it to only use the 2.4Ghz band by selecting "Override Group Config" option for WLAN Group under the 2.4Ghz band section of each AP (this is a seperate SSID for Chromecasts as they don't work on the 5Ghz band).
However now it seems that the other 2 SSID's no longer broadcast on the 2.4Ghz band. Is this what usually happens? Is there a way I can restrict SSID to 2.4Ghz without affecting the other 2 SSID's