[SOLVED] Administrator pasword no longer accepted upgrade 4

Administrator pasword no longer accepted after the upgrade to Mageia 4
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When logging into safe mode the system ask for the root password and accepts here my normal root password
what is also valid for the Mageia Control Center - but Control Center does not accept this password no more.
Also seems to have lost the ability to open a terminal window
I seem to be in a Gnome graphical environment - but looks incomplete
Can for example also not minimize Firefox when up....
Want to try for a reinstall, but when using the full system CDROM from Mageia, all the system does is booting
from the DVD and I'm back in same situation when system is up.
As mentioned - when I get into safe mode, system ask for a root password and accepts it normally.
Is there a way to solve the password issue from that point...?
--------------------------------------------------------------------------------------------------------
When logging into safe mode the system ask for the root password and accepts here my normal root password
what is also valid for the Mageia Control Center - but Control Center does not accept this password no more.
Also seems to have lost the ability to open a terminal window
I seem to be in a Gnome graphical environment - but looks incomplete
Can for example also not minimize Firefox when up....
Want to try for a reinstall, but when using the full system CDROM from Mageia, all the system does is booting
from the DVD and I'm back in same situation when system is up.
As mentioned - when I get into safe mode, system ask for a root password and accepts it normally.
Is there a way to solve the password issue from that point...?