I'm having a weird problem. Talking to Nicholas in Dirftwood (he's behind Trader Haran's stand having a picknick with his wife) breaks my character.

Once I have talked to him and gotten the clue about the Miracle Healer, the character who talked to him says a line outside dialogue and after that you can't speak to anyone with that character anymore.

This problem persists over releading or restating the game and you can break all 4 of your party character that way.