I'm on r22967 and 5GHz devices in the same br-lan are unreachable locally. It's as if I have the wifi Isolate Clients setting on, but I don't (BTW I don't have any wired devices connected).
Pinging the device by name resolves the ip but results in:
Pinging eeepc.lan [192.168.2.205] with 32 bytes of data: Reply from 192.168.2.222: Destination host unreachable.
If I move over to the same br-lan 2.4GHz network, communication to the device is OK,
however... if I switch back to 5GHz, communication is also restored, until I restart the device then the communication ceases until I do the same procedure.
edit... now both 2.4 & 5GHz crashed, no SSID's broadcasting!