I was installing downloaded maps via UltimateToolKit (app). Then I tried editing the world. After I had exited, I would attempt to load the world but it just stops loading on "saving chunks" during the loading process. The same happens after backing up your world.

What I expected to happen was...:
I was expecting to back-up my world or load the world without any issues

What actually happened was...:
It stop loading and never opens!

Steps to reproduce:
1. Download and install Superflat World No Villages (Creative) via UltimateToolKit (app)
2. Edit the world, exit attempt to back-up your world (manually or) via PocketInvEditor Pro
3. Load the world, then it should stop loading for an unknown reason?