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 the chests and doors do not respond (even though it's registering a right click on the chest/door because any item I'm holding does the blocking animation). Sometimes, it will register it 10 seconds later and I'm staring at the chest inventory. Even then, anything I move or throw out just resets back to its position in the chest after a few seconds.