[SOLVED] one user gets black screen after login...

Hi everyone,
one user on my system (Mageia6, graphic card is IntelĀ® UHD-Grafik 630) gets a black screen after login...
I tried to use a different display manager (xdm, sddm, gdm...) but this does not solve the problem...
Also it does not matter which environment (plasma, LXDE, XFCE...) the "blocked" user chooses... a black screen is all he gets.
Note that this user can go back to the login screen (SDDM or GDM or...) when he does CTRL-Alt-Back...
The other users are fine and can login just as used to.
Any hint ?
Thank you !
Vincent
one user on my system (Mageia6, graphic card is IntelĀ® UHD-Grafik 630) gets a black screen after login...
I tried to use a different display manager (xdm, sddm, gdm...) but this does not solve the problem...
Also it does not matter which environment (plasma, LXDE, XFCE...) the "blocked" user chooses... a black screen is all he gets.
Note that this user can go back to the login screen (SDDM or GDM or...) when he does CTRL-Alt-Back...
The other users are fine and can login just as used to.
Any hint ?
Thank you !
Vincent