Hi, ran into a problem tonight. Tried to add a player who had recently left another alliance. I could extend the invite, and he didn't have an alliance affiliation listed with his name, but he couldn't accept the invite - it gave him an error message.
Later, I kicked a person from my alliance. The person was removed from the member list on the alliance tab, but could still see and post on our alliance chat, and still had the alliance designation with his name.