I dont know that there is a way to fix this, and I have looked around and searched for it without much luck so here is my go. If you login to a server that is out of date with a more up to date patch installed (Say, Server-1.7 and you have 1.7.1) the message you receive to tell you your outdated is sometimes faded and very easy to play through. And if a player were to choose to they could continue playing on that server running through any city they want in a full sprint without pulling zombie aggro, both sight and hearing meters stay at 0. Easy kills for them, player or zombie, they make no server side noise, so you couldnt hear them coming up the ladder, and they have free roam over say Cherno, with all the loot they could possibly want. When I was exploring this, I also was able to dupe several items by logging onto an up-to-date server. This might be a mess, anyway, I feel better about it now.