Hm, never seen that one.
Are you the one loading the save, or is a remote host doing it? How many players are involved? Do other players connecting to the same host also get it?
Have you managed to play with the same people on previous occasions? (And, if so, have any of you changed anything - settings or versions, say - since?)
Does starting a new game with the same players work properly? How about starting a new game, saving, and then loading that saved game?