AlphaPro720

So when I went on an AotBT multiplayer server I went into the survival portal. Everything was fine and dandy until I moved. When I moved AotBT froze up quickly, turned grey and then for the finale closed and went back to the launcher. This only happens on multiplayer. It started happening last night. The link to the crash is here: http://pastebin.com/ixpDA530 I also deleted the mapconfig thing. I have it in my recycle bin.