the new Launcher can't start if logged in with "keep me logged in" checked. 
happen after update launcher to windows store versions.

i need to delete file.
"launcher_accounts_microsoft_store.json"
will fix it for me.

like the Token for keep login bug or something? idk?

=======================
(more info)
==account?==
-mojang account

==happen when?==
-just install minecraft with launcher then logged in with "keep me logged in" checked.
if close the game or launcher.
will not able to start again.

==what look like when can't start launcher?==
-launcher windows popup black screen (of nothing).
and then close in seconds. 

-the process "Minecraft Launcher" and "Minecraft.exe" still run in Task Manager.
spam open launcher will add more!

==PC?==
Processor    Intel(R) Core(TM) i5-9500 CPU @ 3.00GHz   3.00 GHz
Installed RAM    8.00 GB 
System type    64-bit operating system, x64-based processor
Intel(R) UHD Graphics 630

Edition    Windows 10 Home Single Language
Version    21H1
Installed on    ‎25/‎11/‎2563
OS build    19043.1348
Experience    Windows Feature Experience Pack 120.2212.3920.0