My best general in my current XC Roman campaign seems to have gained the Immobile trait. He can only move one tile per turn, and does not have any traits that explain such a drastic loss of movement points. I looked through export_descr_character_traits and found Immobile, which I see is also hidden, so I think it is this trait he has picked up.
My search of the forums indicated that this was a trait created to keep the Indie Greek Generals from leaving their cities. Are player generals supposed to get it as well? Or is this a bug?