@agony It sounds like a FW issue and the inability to revert back to the previous FW release, makes things annoying. Why don't you contact the tech support and ask them what your options are ? Maybe...

@Inquisit0r Are these screenshots from AP mode ? I supose you're using the C6 in AP mode. If yes, would you check in Basic=>Network Map that the correct number of Wired/Wireless clients are reported...

@brainii Just out of interest what's your C6 DHCP setting: Auto or Off ? I am using C6 with 1.3.6 FW as an AP, with DHCP Off, and it works normally, except not showing the wired/wireless clients...

@brainii The exclamation mark means 'Poor network'. How's your internet connectivity, is the speed normal ? That's probably a FW issue, FW 1.3.5 displays the wireless clients number for sure.

@brainii Do you use the blue/Internet port for connecting to your ISP device ? How about wireless clients - does it show their number on a Status page ?

@Hristian SPI Firewall shouldn't causing this problem. Any other hardware/software firewalls isntalled in your network/computers ?