The 0% bug of Minecraft 1.9

For awhile I wasn`t on my computer. When I got on was right before the update and it was fully functional. Afterwards on 1.9 I had just updated my skin and when I created a world and went in it acted normal. Then right before it switched from the loading dirt screen I saw 0%. When I went it took longer for the world to appear. Then, it crashed. I reentered a bunch of times but it didn`t work and even after removing my skin and reinstalling minecraft it wont work.

What I expected to happen was...:
I guess you could say I thought I would be able to play on my minecraft. I tried hard...

What actually happened was...:
...but all the fixes I came up with failed so I came here.

Steps to Reproduce:
1. Go into game like normal.
2. Create new world (whether or not this effects outcome is unknown but just in case)
3. Enter world.
4. It should trigger after you see 0% and if it takes a while to load.