I started experiencing graphic glitches immediately after last patch and ever since. They are basically disappearing terrain levels and invisible staircases, like in Moria and that area with the wargs and Arnorian relics in the Lone Lands. In some cases it is funny to be walking on air or see mobs doing the same, but in others can be frustrating, like not being able to find a way up to where you need to go. Has anyone else experienced this?