My friend and I were playing last night and ran into this potential game breaking bug. If a player attempts to talk to a companion (who has the ! overhead) while the other player is talking to another NPC nothing happens and then from that point on nobody can initiate a dialog with anyone. If the game is saved in this state then reloading will not fix it.
I have not tried to repro this bug in single player so not sure if it happens or is even possible.
Last edited by Vork; 27/04/14 04:05 PM.