Quest dialog with Mendius does not end it just disappears. The quest box is closed and I cannot select any more text but I cannot walk or use inventory items. The go to homestead button returns a "You can't go to the homestead while in a dialog" error.
Edit- it seems to be related to the dual dialogs. I tried a few times and if you avoid the them you are fine. Several times the dialog ended but I switched to the other character and there was a dialog option still -
