I clicked the minecraft app on my desktop, and then the minecraft launcher was just a white square with nothing on it. At the top of the box, instead of saying Minecraft Launcher, it said mojang://launcher/launcher.html. I don't know what kind of computer mine is but i do know that it is windows 10 or higher. This worked yesterday fine, I haven't changed anything and now it doesn't. I made sure that I'm not running windows XP or vista, and still nothing. In case this helps, my username is strebicus.