Anyone else have this problem? I tried to do the quest step by step without looking at spoilers or going off to find the underground base until I got it out of one of the settlers. Then I sided with them, and they are all happen when I returned... except for Jacob. I think he talked to me at first, but then lost his voice mid way and since then he became a mute. The interesting thing is that his mouth doesn't even move, but his head and body still moves as if he's talking, so it's like a mute guy trying to communicate but without the sign language. And the most hilarious part is when I turned in some raider killing quest, I chose the "I kicked their ass" option, and he smiles with his mouth closed as he nods and moves his arms around like he's talking. It's both funny and creepy at the same time.