Cannot Create New World

 When I tried to create a new world, it minimized Minecraft. Please help! I need Minecraft for a YouTube video!

Steps to Reproduce:

1. Make sure you are offline
2. Startup Minecraft
3. Select Singleplayer
4. Press Create New World
5. Press Create New World again

Observed Results:

Once you press the Create New World button in the Create New World menu, it minimizes my browser and won't let you create a new world when you try to. create one.

Expected Results:

When pressing the Create New World in the Create New World menu, the Minecraft world loading screen should appear and after a couple minutes or seconds a new world should generate.