I was trying to summon Skeletron but when I went to the Old Man just after night hit, the Old Man wouldn't talk. The circle button and his speaking cloud appeared to say that I could talk to him but when I pressed circle, nothing happened. All other NPCs still talk and the circle button acts as it should otherwise. I can also talk to the Old Man during the daytime, it is just during nighttime that he won't respond to summon Skeletron. I am playing a large, normal world at the moment. Anyone else find this bug and know how to get around it? Thanks!