I also notice that when I cast a spell it creates square artifacts on the ground where it hits. Also, when I press and hold a spell I'm casting, I seem to see through the bottom of the world.
With the way this game has launched and all the new bugs introduced with each patch, I should have known better than to install this DLC on its day 1 rollout.
I'd list my PC specs and all but I think it's a moot point because when I uncheck the HD Pack ESMs, this problem stops completely, so it's definatley something going wrong with the inclusion of the texture packs. FYI - I have ZERO mods installed (other than this Bethesda DLC) and no custom tweaks to my .ini files.

