Where are you checking to see if the Guest WiFi clients are using the YazFi IP addresses?The next thing that's puzzling me is that I have YazFi enabled and "applied" the settings, but preexisting guest devices are not moving over to the new subnet. I tried power cycling one of the devices, but it did not cause the device to move over to the YazFi IP address range. What am I doing wrong?
You don't look at the Network Map information, instead look at the System Log > Wireless Log page for the correct YazFi WiFi guest IP address assignments. Or do a "cat /var/lib/misc/dnsmasq.leases" when SSH'd into the router. Or from the YazFi CLI menu choose option 2 "Show connected clients using YazFi".