What happened was when I opened my inventory, I saw that the player modle was messed up. (It was the same in 3rd person mode). When I switched back to the default textures, it was fine. This is without custom shins (uploading them). This was with a 16x16 resource pack.
Steps to Reproduce:
1. Launch with an account without a custom skin or play in offline mode.
2. Use a Resource with a custom default skin.
3. Go into a single player world.
4. Go into 3rd person mode.
5. The player modle is messed up.
This is probably caused by the new skin format being incompatable with the old one. Oh, and it's model, not modle.