1.7.6pre-2 Items Missing

I updated my single player from 14w11b to the 1.7.6pre-2 release, and when opening my world all of my items were missing. I had opened mc in the 14w11b snapshot and remembered that there was a more recent version out. My items were not missing in the earlier snapshot. I checked my chests in the 1.7.6 release and the items were missing there as well.