Preview don't work on desktop

I met the program yesterday (12/04) and I started to build my first game, all was working very well. But, today, when I get back to my project, the preview don’t work. I tried create a new project using the examples but not even examples work the preview. When I click in the preview buttom the program window flashes and nothing happens. Help please!

I’ve test the version 4 and preview works, but in the version 5 don’t.

Have you tried reinstalling GDevelop? :confused:
Which beta version are you using?