Put the summary of the bug you're having here

*What I expected to happen was...my world would save and I could delete worlds I didn't want anymore
:*
Describe what you thought should happen here When I exit a world that I have named, I thought it would save to go to again.
Describe what happened here When I exit, my world turns into creative without a name and if I open that world my stuff is there just in creative and I can't switch it back . This started with newest update to 0.8.1 My worlds I saved before the update switch to creative and lose their name if I click on them too, so I have lost some. I can't delete these unnamed worlds.

Steps to Reproduce:
1. Create a world in survival and name it.
2. ...Quit that world either by going to main menu or closing game
3. ..Click play, you will see the worlds did not save correctly. Try to deleete a world. It won't.