Yesterday my son purchased Minecraft PE for Android. It is installed on a tablet on which multiple Android users are active.
When we are trying to create an new world we choose "Play" --> "Create New" --> "Create New World" --> change some game settings and give the world a name --> "Create"

After that a message is given "There was a problem loading this world.
If we then later try to open this world we get the same error message.

Android version 6.0.1
Minecraft P.E. version 1.4.4

Tablet: Denver TAQ-70303 7 inch Quad Core tablet with16GB