Not too long ago I've started to have some problems with Minecraft where I would spawn from where I left off, however and while 50-100 squares around me would load perfectly fine, everything past that would not. When I would walk to that limit, I would begin falling through the ground and go very far into the mines, when suddenly I would magically appear on the square I was at before I fell.
When I would exit the game the program would not close properly and it would not save everything properly, and I would start in the area when the game still work.
And whenever I would right click on something, like a chest or craft table, my character would attempt to punch/cut/ or do whatever is appropriate depending on what item he is holding.
I, of course, tried restarting my computer and that didn't work. Hopefully this issue can be caught and fixed.