I have one werewolf in my game who won't stay cured. I play rotationally. I've cured her twice now, then gone to play a different household, and she immediately becomes a werewolf again while I'm playing a different household.
At the time that I cured her, she was the leader of the Wildfangs pack. I expected her to be automatically booted out of the role when she was cured, but she wasn't. I've since had a different Sim take over pack leadership, but the original Sim still keeps turning into a werewolf when I rotate away.
Playing on a Mac, all updates installed, no cc/mods.
Edit By crinrict: Added pack tag to title.