All textures, including player skins are invisible when in-game. Menu works fine, messages on signs work fine, but they load for about half a second then all disappear. I can see the sun, sky, clouds, box around blocks just not my hand, I can also see SOME items I'm holding, which seem to be items, not blocks.

Screenshots:
http://puu.sh/6P3Hu.jpg
http://puu.sh/6P3KW.png