I've got an annoying but. Some of the sick NPCs like Richard Nittencroft at the cemetery, I'm unable to talk to and multiple others. I'm on chapter 3 and when I try to talk to Richard for example, the game goes in to loading screen and then returns back in to game without letting me talk to him. I've tried resetting the game, but it won't help. I can't cure the NPCs or talk to them and I'm afraid this will happen on a main mission leaving me unable to progress further. Already it's made me miss some of the side stories and probably will kill the NPCs, if they're left getting sicker and sicker...