SPOILERS, LAST WARNING
So, evidently, the dialogue option where you confront Kagha about the letter you find in the swamps (that proves she is in league with the Shadow Druids), causes the game to wig out.
Whichever character selects the dialogue, she says "what" and then that character and every NPC enters a weird state where they're still technically in dialogue, but none of my other characters can listen in, and the main PC can't do anything.
Anyone else had this, and found a fix?