While creating a new world in creative mode The loading screen gets stuck at building terrain while generating the world .Iam using Bluestacks on win 10 pc to play the Minecraft PE. I was prompted with the new update just today .

I utilized seed 190800072 for the world and set old as world type.

I've attached a video here with the use-case of the bug .

UPDATE : I tried running just old world without seed and the same bug was generated .I tried on my phone and there was no problem ,so it has to do with using bluestacks on windows 10.

I've just bought Minecraft yesterday .Thanks you very much.