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.
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duplicates 1
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I don't know how to troubleshoot launcher issues, but you may want to try the older launcher, which is available from the alternative download page.
And, no, resolved as duplicate is correct here. MCL-5511 is still open, meaning it's not fixed, but further discussion is probably best there - tracking the bug in two places does not work well.
Why is this marked resolved??? It is not at all!