I haven't seen this happen since I have been our team leader. Our team is listed as "closed" and "by invitation only." However, yesterday, a new player suddenly showed up as a new member. After checking with everyone on our team, I have confirmed that no one sent an invitation to this person. Also, as team leader, I didn't invite or okay any request to join. Is this a bug? Very curious as to how someone could do this. Any ideas would be appreciated. I have left this new person on our team for the time being but don't want to post the name here.