I've had Dawnguard for a while and this never happened before, but I just started a new character. I had Faendal with me and we are running DG quests, I was in the DG Valley and tried to fast travel. Had always killed the vampire spies and everything but the games says I can not fast travel with enemies near by. I searched and found nothing. I then tried speak to Faendal and he turned hostile and attacked me.

Is this a glitch, or did he possibly contract vampirism? He would not yield and I was forced to kill him. Generally when you anger a follower, lowering your weapon causes them to leave you alone. Anyone else had this problem?