Partial disappearance of ground textures in at least two locations in Labyrinthian public dungeon (western Skyrim) since Markarth dropped this morning.
One of these places is an area SW of the Tulnir boss, just up the stairs past one of the entrances to the interior, chest spawn location near one of the trash mob groups (with a big armoured troll). Part of the ground is missing and cannot be used - you "walk" on the underlying texture instead, and have to jump up to the regular "ground" or walk around to progress.
The other place I've seen is just uphill from that (you have to go around near the group challenge boss to get there), also at a chest spawn location with mobs around it.
201102-007059. PC/EU and PC/NA.