I just noticed that if you save your game while a unit 'party' is damaged, when you re-load the unit becomes a single unit! Usually, if a party gets damaged, you can reheal back in one of your towns back up to full strength.
Last I saved when my party was down to two guys. This morning when I loaded the game and went back to heal, I it only healed to one guy. I started this game in 1.06 and noticed the problem in 1.06.