When adding a new member to a controller team, the new member will cycle between "Uploading configuration" and "Resetting configuration" states.
Wireless controllers: MSM 765zl . Software version: 220.127.116.11.
I had the same problem on 18.104.22.168. It seemed to be caused by a different regalaroy domain on the members.
I resolved it by setting "Controlled AP-Configuration-Country" to "default (USA)". Then the members got synchronized and after that i could restore the Country to its correct setting.