Earlier today, my friend discovered that he could not sign in to TF2 Center or post any kind of topic on the forums. He gets redirected to rc.tf2center.com/banned and has not done anything wrong. No spamming, abusive language or hacking of any kind.
His Steam profile: http://steamcommunit...m/id/kanestick/
His Steam ID: STEAM_0:1:46043290
His display name: MTP [TF2TC] Banker
I hope to hear from you soon and I'll give you any more information you may need.