Logged into PRoCon I noticed the following message for players that join:
PunkBuster Server: VIOLATION (AUTO-UPDATE FAILURE) #141: PlayerName (slot #1) This PB Server Requires (A1386 C2.279) - Error loading pbag [PlayerGUIDHere (-) XXX.XXX.XX.XX:XXXX]
PunkBuster Server: Kick Command Issued (This PB Server Requires (A1386 C2.279) - Error loading pbag) for (slot#1) XXX.XXX.XX.XX:XXXX PlayerGUIDHere PlayerName
That kicks the player of the server back to battlelog with the message "You have been kicked by an administrator". This happens to me too. I've tried updating my punkbuster files for the BF3 client, but it had no effect.