The main quest is totally bugged. I progressed as far as I could, but at a certain point there was no way for me to complete the quest and now I get the Failed Quest notification every few days (ingame). Really annoying. At this point I'd rather make no quests at all.
Yeah I have the same problem, no matter what NPC I talk to. Tried verifying the game files but nothing changed for me. After my game crashed and I tried to reload the save file I got the message : "Module mismatch "? Not sure what to do except start a new campaign.