Put the summary of the bug you're having here
What I expected to happen was...:
minecraft to open and start the game after I logged in on the new launcher.
What actually happened was...:
a crash. the game never opened into a new window.
Steps to Reproduce:
1. Open Launcher.
2. Log In.
3. Click Play.
Incomplete without crash report. Please attach crash reports in the future to tickets about a crash.