Some people are saying that if you install the HD assets and then install the disc, that some, but not all, of the HD assets will not load. The thing is, nobody has any reasonable comparison pics, or pics showing textures that didn't load.
Aren't you supposed to launch the HD pack installer while you're in-game?
edit: oh I see... person doesn't install the game, but installs the HD pack, but then proceeds to install the game?