I can't enter my world. It only happened to this world so far. I used MCedit and
NBTedit to see if I could see anything out of the ordinary, but there was nothing to see. When I enter the world, I still have everything in my inventory, but I can't see anything. When I press F3, I can see my Y axis is decreasing slowly, as if i'm sinking in water. But I don't die once I get below Y: 0. I once waited a long time while sinking below Y: 0, and suddenly, I was back in my house. Only problem is: I couldn't open ANY of my chests, And when I pressed a button or pressure plate, It stayed pressed and didn't activate anything.When I log out of the world, the world isn't on top of the world-list, as if I never entered it.