i meet this problem too. i changed standardjboss.xml to fix this problem. If you use stateless session bean find <invoker-proxy-binding> with name stateless-rmi-invoker and change the config as same as <invoker-proxy-binding> with name clustered-stateless-rmi-invoker.
But i still have problem with rmi load balance and fail over. Any body help me ? rmi smart stub can not update list alive server. So when rmi is invoked, you shut down 1 jboss after that restart this jboss. Smart stub only know that 1 jboss dead, it not know that jboss is restarted