Having successfully setup a guest network on both 2.4Ghz and 5GHz for guests to use before, our first guests since going to 3.8.9.2 arrived - and it's not usable at all. Not on their devices or any of mine which used it before. Rebooting doesn't fix it. None of the isolate boxes are ticked - nothing changed this end except going to 3.8.9.2 . Do I have to re-enter the passwords or something? All suggestions gratefully received.

Don't normally answer my own questions but it seems 3.8.9.2 had wiped the LAN / VLAN configuration and LAN2 subnet settings. HTH somebody else out there.