I'm near Andora and I decided to peacefully negotiate with the leader, Illium. Unfortunately, when he gets interrupted the game turns back to my other 5 party members below the cliff and then the game just stops. Well, it doesn't stop, its as if it is stuck in a cutscene mode (later, it turns out Sherincal is supposed to appear). I redid it, but it stopped again, so I decided to just go right through and destroy the Aurilites. Which is disheartening because I really do like diplomacy and I do want to know what happens. Is there any fix for this or do I just have to go on? By the way I'm using windows 7 and have the NPC mod installed.

EDIT:

I decided to try once more. I chose a different dialogue this time, the one where you intimidate Illium instead of just saying farewell after asking questions. So why does one dialogue work over the other? Is it just my game or an actual bug?