Problem that 226clients didn't send the password to login in a server as admin, is fixed already, among with a lot of other known 226 bugs, such as the famous "ghost" bug, that caused that you had "ghosts" of the players and an old copy of the scoreboard if you joined the same level twice.
Fixed as well is a replication bug that caused trouble with 226 servers, another one which caused "head can't be seen if players body / chest can't be seen" (also fixed for feet)
and a lot of others I currently can't remember...will complete this list from time to time