Trying to play MV games - white screen, won't start

[Matseb2611]

I've come across an issue when trying to play any game made in MV which I download from this site or another. I don't have any problem (at the moment) running MV or playtesting my own project, but whenever I try to launch someone else's game, the window just opens and hangs in a white screen. I think it might be some problem with connecting with a browser or some kind of windows firewall/blocking issue. I tried to launch the games from the 'index' file onto the browser rather than through the .exe file. Interestingly enough, it's blocked on Chrome and Internet Explorer, but works on Firefox.

Is there any way to be able to play the games through the .exe file rather than having to try and open it via the 'index' file in Firefox? What could be causing a problem?

Another thing. About a month or two ago, I remember playtesting someone's MV game and it worked all fine, but that same game along with every other MV game won't open anymore. I figured it might be something to do with one of recent windows 10 updates. Does anyone know which settings might be interfering with launching of MV games?

Thanks in advance.