Hi.
Here's how it is. I'm well deep into the game (underdark).
Viconia turns to Valygar, but the conversation doesn't fire up. She stops doing whatever she's doing once every 2 seconds and turns to him. She can barely move, since she cancels all actions once every 1-2 seconds.
Killing him or her helps temporarily and the game is playable while at least one of them is dead. After I ress them both, the bug immediately reoccurs and the game becomes unplayable again.
(I'm not sure whether it's IEP or banter pack's bug)
How can I resolve this and help you fix it?