Board Thread:Questions and Answers/@comment-26400899-20150515022855/@comment-26317437-20150623144525

Well, to be 100% sure that your world saved changes, just click "exit to title" because then it can save changes. In most apps, to save progress of the game, you just need to pause it and it saves then until you pause again or until it auto-save changes. But in MCPE, the menu button doesn't pause the game meaning that the world is movig around you even if you are changing the options meaning the game isnt saving your progress.