Got an immigrant who would not accept healing (fortunately, or unfortunately, depending on how you look at it, he was not critical) And for at least months into the game the moron would not friggin' eat!!!! I could make him be the guy hauling from the stove, and from time to time, he would eat while standing on the stockpile, but usually the jerk could't find the meals he just dropped off. If I timed it just right, I could have someone else take the lavish meals from a stockpile or shelf and put them on a stockpile, then delete the stockpile, and he would eat the lavish meal on the spot, then put one into his pouch, but I could only occasionally get him to eat, let alone refill. No one else has a problem. If it helps, his only perk is Vigorous.

Save/quit/load sometimes worked, sometimes not.

I'm tempted to leave the jerk defenseless in front of the next attack. No one likes the twit, so maybe they would all be in a better mood.

[EDIT]
Ive never seen that kind of behavior up until the latest patch (Prisoners) and likely I can't get another save where the n00b has Vigorous, so I don't really know how to isolate it.
[/EDIT]