I've noticed a bug trying to turn in scourge stones. Automaton crashes and prevents the NPC's turn-in box from being displayed until you exit the game and log back in. You can get around it by shift clicking to avoid the gossip code, but if you back up to the main screen to turn in a different type of stone, it crashes too. I'm currently running version r75649.
Could you look into the gossip code for this?
Thanks and great mod!