I edited a resource pack on a world and played it. It made a pop up box saying Saving Resource packs and it exited to the worlds menu. I tapped the world and nothing happened. All of my worlds were like this! To play on my worlds I have to restart Minceraft.

How to reproduce: 

Get a resource or behaviour pack from your favourite website. Apply it to a world and hit Play. If it logs you into the world, try again. If you are in the Worlds menu, tap the world. Nothing should happen!!! Tap another world. None of the worlds are working!