Ok so I'm playing on a server , it changes maps and boom I get kicked out to the game browser with the message that goes something like ,

"This server does not allow modified content.  Please revert to the official version."

Well I have nothing that EA hasnt given me so  I'm at a loss as to what the issue is.  I have the latest patch. and play on lots of servers with no problems.  Anyone else ever get this message or have a solution? Ideas?