Only edges of blocks, liquids, items and mobs are visible when a new world is created

Put the summary of the bug you're having here

What I expected to happen was...:
Load a world, and see all the blocks as normal

What actually happened was...:
Only edges of caves, water, lava, mobs, items, and transparent blocks (torches and levers) loaded. Desperately needs to get fixed
(also skins aren't loading)

Steps to Reproduce:
1.Load a world :/