Crash when closing a score tab and creating a new (Windows 7 HB)

I´m using (testing) the latest MS nightly build.
SO: Windows 7 Home Basic

I opened the MS, changed the barline of some staff, closed the default score without save, created a new one with the left-upper corner button. I left all the fields (composer, title, copyright, etc) blank and clicked Next. The MS crashed.
I tested it only once.