Unofficial patch? Not sure where and when I spotted these first, but two things have changed. First, Nihlathak used to be in town when you entered Arreat Plateau in order to explain his side of Anya's disappearance and didn't vanish until you entered Crystalline Passage. Now he disappears the moment you enter the plateau. I can't verify if this is Battle.net-only, but it's happened twice now; can't be a coincidence. Second, shift+attacking without a target used to aim in the general direction of the cursor, as in Diablo. Now, it aims at the nearest enemy even if it's in the opposite direction. Not sure which is better, but I'd assume that, if there has been a change, the routine for picking an enemy to attack would try choosing one in the direction of the cursor first. After all, if that's the direction you're trying to make a path towards it makes no sense killing something behind you. If anyone else notices this behavior, or has further information, please reply.