Void fog problems

When I had originaly made this world. It was around the 1.4.7. time. Then At the new update I play my world and I see a black horizon with void fog. This is my best world so please help
What I expected to happen was...:
I would build something awesome like I do everyday

What actually happened was...:
I saw a black horizon with void fog

Steps to Reproduce:
1. Create a normal superflat world with the most recent version