Minecraft will not load from the launch engine

Put the summary of the bug you're having here: the launch engine will start up, but when it comes to loading the game the window says " not responding".

What I expected to happen was...:
Describe what you thought should happen here: thought i would just do the usual, Turn on and off.

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...