All items dissapearing from inventory and chests 14w03b

Put the summary of the bug you're having here

What I expected to happen was...:
Describe what you thought should happen here
What I expected to happen was that everything would be in my inventory and chests.
What actually happened was...:
Describe what happened here
What actually happened was I opened minecraft 14w03b and all of my items disappeared from eveything in my world (chests, furnaces, inventory). I have no way to get them back. Other worlds that I opened were fine in later versions though. My world was fine in snapshot 14w03c, but after I opened it in 14w03b it all went wrong. I had been playing in 14w03b for awhile and everything was fine besides a few crashes. I opened it today and I had nothing in my inventory or any chests. I have no recent back-up. It was just this version and now it is gone in every version that I have.
Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. Open minecraft and load 14w03b
3. open world of choice
4. everything is gone.