Put the summary of the bug you're having here

What I expected to happen was...:
I thought it would load and I could play the game

What actually happened was...:
I loaded the game and was waiting and out of nowhere the title screen pops out and then it kicked me.

Steps to Reproduce:
1. You push singleplayer.
2. You choose a world and wait for it to load
3. You keep waiting and for a split second it goes to the main menu and crashes