I was going to add mods to my game and downgraded to 1.7.10 to do that. I then figured out that I didn't want to install mods so I upgraded back to 1.8.1 and went to play and all my stuff is gone except my experience. Just to be clear my house and everything is still there but my chests and Inventory are not.
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Yeah no, the mods being involved invalidates this report.

@Mustek
Modifications have nothing to do with the issues experienced by the reporter. It's simply a case of downgrading.
@Karee
Downgrading is not supported.

See MC-45009