Okay, so I was playing Minecraft a while ago and I had just finished a new map that had lots of paintings. Then I logged off. The next day, all the paintings were gone and I had hidden music disks in chests but only some of the music disks were still there. I am unaware of whether or not I had switched profiles/versions (i.e. from snapshots to 1.7 or whatever). But that map was creative so it wasn't a problem. I have another map that isn't creative, though. I was playing on that yesterday. When I logged back on today, EVERYTHING in my inventory was gone, along with everything in my chests and furnace. I'm pretty upset about this because, in that world, I had an enchanted diamond pick, enchanted diamond sword, 40+ diamonds, a full set of enchanted iron armor, and upwards of three stacks of iron. This time, I'm certain that I didn't change versions and, like I said before, I'm really upset about it. Anything to prevent this from happening again (because I'm 90% sure that my stuff is gone forever)??? I'm playing in 1.7.4 if that makes a difference or anything. Thanks in advance.
All my stuff is gone?