I've read that there is no way to get the 'good' ending for the Hub due to a bug even if you find the caravans, don't do any quests for Decker and not enter after 130 days or so ect. Is there a way to fix this?
No easy way, as it involves changing the exe. One fan patch has restored a bad ending for the Brotherhood, but I don't know if there's been any progress made on the others.