Total inventory loss including chest contents

Last night saved, this morning all inventory gone. Experience level remained but all items carried, armor worn, all contents of chests, all fuel in furnaces gone.

Single player, survival mode, no mods, no skins.

Snapshots were disabled. To the best of my knowledge I was in 1.7.5 last night, now in 1.7.6. Tried reloading minecraft no change. Other, older saved games unaffected.

Cannot reproduce.