Unable to save settings - Quickfix

Last Friday when i started the sim, i heard music........which means BIG TROUBLE!
I always turn the music off (annoying) and save before doing anything else.
Now the app is asking me to choose various settings bla, bla, bla.
After doing that i turn the music down save and exit.
Restart...................................music! well you get the point i'm unable to save any settings.

I mean the tune isn't that bad but now i know why it sounds so sad.
You are going to sit there for hours and hours troubleshooting with a ruined dinner, banging your keyboard (wireless)
against your forehead - right ?

My sim is installed under C:\Z_F-sim\MSFS2020
The fix:
I changed the folder name from uppercase "Z_F-sim" to lower case "z_F-sim" and
changed the path in "UserCfg.opt" accordingly - last row.
You can of course change the name and path to whatever you want.
Restarted the sim and it worked, everything was back to normal.

Location of the Usercfg.opt:
C:\Users\your name\AppData\Local\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalCache