I recently got a 7782, and confirmed that it works fine when deployed wired into my network. However, when I disconnect it and try to have it mesh, it will search for a while and then show an island SSID. I've attempted the island recovery procedure, but it doesn't seem to work.
I have verified that an R700 and R600 do appear to mesh together. It just seems specific to 7782 vs R600.
It has been stated in various places that AC units should mesh with 802.11n units. Is this still the case?