So, after pouring through this thread for some answers I find myself frustrated even more. I'm glad that you may have figured out your problem but it is not a solution I can use as I do not use AVG. Basically I have the same issue. I loaded up on my brother's server this morning for the first time. Everything went well until I died. Because your client decided to close at that point I was forced to attempt to reconnect. That's when things went to shit. I can't connect, I get the same error messages that Vantus with the failure to load. Other people can connect to the server and are, as I type, playing on it with no problems. One has avast the other uses norton, I use Microsoft security essentials. I just disabled the real time protection and that did not help the situation. I've attempted deleting the client side for the server ( I do not have access to the server folder since I am not hosting) and running without the real time protection. That didn't help I've attempted to validate the files. Nothing was corrupt I've attempted to run in compatibility mod with various OS's selection. Nothing I've run as admin I've tried combinations of all of them. Basically I am at a loss. I rather like this game and it would be sad to no longer be able to play with my friends.