When I launch minecraft, the game starts to open normally, but stops at the screen that says "mojang". Then it doesn't respond.

Put the summary of the bug you're having here

What I expected to happen was...:
Minecraft to load normally.

What actually happened was...:
Minecraft stopped responding on the "mojang" screen.

Steps to Reproduce:
1. Open launcher
2. launch minecraft
3. wait forever at the "mojang screen"
(please note that I did not have this problem before the new launcher was released)