Startcenter cannot be closed after trying to create a new score
1. Open the startcenter
2. Create a new score from the starcenter (the window "create new score" will be open behind the starcenter window).
3. Try to close the starcenter window to be able to see the "new score" window.
The window will not be closed and you will have to force MuseScore to be closed.
MuseScore nightly rev. 5cb7fba on Windows 7