Ever since I downloaded 1.7.10 (not any of the snapshots) my primary world has been corrupted. It loads very slowly and when it finally enters the game the framerate becomes really inconsistent. It freezes then works then freezes every couple of seconds.

The main problem is that even if the world is slow and buggy, none of the progress I do saves. Even if I move around a bit and break some blocks, the next time I load the save I'm in the exact same spot with everything the way it was before I loaded the save last time. I also submitted a report about how the update made my chests/doors/other things to interact with not work.

I've uninstalled and reinstalled the game as well as trying the game in each of the last 10 updates.