We have a Zone Director ZD3050. Our 7962 Mesh AP's are taking 30+ minutes before they join the Zonedirector then they will work fine. What is the normal time it should take for a mesh AP to join the controller?
Do you provision your Mesh APs on the wire, before moving them to where you want them? How far are your Mesh APs from your Root/next hop APs? You can see AP neighbors in a ZD debug (with Tech Support's help), and APs need at least 25+ RSSI from both sides for Mesh links to form/stay connected. Is there a lot of interference in 5GHz in your environment? Are you letting the APs choose their own channels?