Situation: When I try to confront Kagha with the Shadow Druid evidence I acquired from the swamp, the camera changes from the conversation camera back to isometric camera with all participants stuck in conversation with black textboxes overhead.
Bug: I am unable to continue the conversation and my main character is forever locked in dialog with no text and no way to escape through conversation. I was able to circumvent this by having a companion outside the conversation (no black textbox over their head) kill one of the revealed Shadow Druids and thus initiate combat, this taking the "attack Kagha/fail to convince Kagha" route.
Conjecture: I believe the game is getting stuck on the "Shadow Druids shift from rat form back to human form" scene. I have seen this scene in previous playthroughs before the latest patch.