In addition to the ones already mentioned, I fairly regularly hear one of my party scream as they fall for no good reason only to reappear with the party. This is annoying but not game breaking. Just today though I'm at
He Who Was
and walk to the chest SW of him and get the following message in my combat log. "Astarian has fallen to his death." and sure enough Astarian was dead with his corpse nowhere I could see. The pathfinding just decided to walk him to his death despite the party walking a perfectly safe click and walk distance away.