I have done most of the quests and am scavenging for more. But There are three I cannot complete along with obtaining a follower. The problem is with Boxcars (Nipton) and Dr. Hildern (Camp McCarren). The issue is I already completed the quests for THEM, but there are three quests that lead to them. When I try to talk to them about it, the only dialogue option is goodbye, so I cannot complete the other quests. The quests are the one you obtain from The scavengers in the basemant of the church in camp searchlight, the quest obtained from the leader of the Crimson Caravan Company, and the quest from Cass telling me to work for the Crimson Caravan Company. The follower in turn that is not able to be obtained, is Cass ... (unless she was a modded follower I saw on youtube).