So, I was just walking around back to my house when my pressure plate didn't close my door. I then realized that items wouldn't drop from blocks. So I relogged. When I came back, There only about 4 chunks loaded, and the syptoms before were happenning again. After 30-45 seconds, 6-8 more chunks would load around where I was and I would snap back to where I started. Even relogging again didn't solve this, and the EXACT (Logging point to what chunks load) thing happened.
I expected to be able to relog and have it fix it, but that didn't happen.
Instead, I'm stuck with a single, useless (and favorite. D world. I have no idea how this happened, but I thought it would be useful to report, seeing as it's a kind of error.
Some general info:
inventory and xp work fine, but chests and furnaces and crafting tables won't upen, and redstone won't update. Sand and gravel don't have physics.
World file included. Take a look if you don't know what's going on.