I have copied a world over from an old computer to a new computer. The older computer operating system is windows 7. The new computer's operating system is windows 8. The world worked fine on the old computer, however when I tried to play the world on my new computer it stays on the loading screen when I open the world and does not change screen at all.

When I double click to load the world I wold expect the loading screen to appear, when it is loaded, the loading screen to disappear. After this the world should be playable...

What actually happened was when I doubled click the world (to open it), the screen goes to 'loading world' and stays there for about 2 minutes. It then resets and then goes to the title screen. Leaving it for about 10 minutes I reopen the world. The loading screen reappears and then, leaving it for about 30minutes, it still shows the title screen. I have left it for about 3 hours and still no world has been loaded...

To trigger this bug:
1) Create and play a world on a windows 7 computer
2) Copy a world over from a windows 7 to windows 8 computer
3) Play the Selected World (on the windows 8 computer)
4) Should stay on the loading screen