Game crashes when entering Creative portal in Litchcraft

Right after entering the creative portal in the Linchcraft server, the game crashes. Other users seem fine. It's just my user id that seems to be the problem. We've try using different Windows 7 account and a Mac laptop all with the same result. Attached is the log file generated by the crash.
My game id is: Meeper21

Any help with this issue will be appreciated.