Black Screen while testing construct game.

I don't know two days back my construct was working perfectly fine, then i updated it with 139 i guess, it was working very well, but now when i run project the browser shows total black screen, i've tried saving project in xampp server, and locally too, is it a bug or i'm doing something wrong. I've tried every single browser but nothing is working for me :'(

Go to your Project Configuration Settings in Construct 2 and change the Fullscreen in browser setting to Letterbox scale, that's what worked for me.