Shutdown option disappaering in Kde menu

Hello,
I updated from Mandriva 2010.2 to Magiea without any problems and the distributiion looks very stable. However, I still have an annoying minor issue.
The shutdown option is disappaering from the menu option. I activated it again from the ooption Configure Your Desktop>System Administration>Login Screen>Shutdown I changed the "Allow Shutdown" Local to everybody but from time to time my option is set back to "Nobody".
Any idea.
Thanks in advance
I updated from Mandriva 2010.2 to Magiea without any problems and the distributiion looks very stable. However, I still have an annoying minor issue.
The shutdown option is disappaering from the menu option. I activated it again from the ooption Configure Your Desktop>System Administration>Login Screen>Shutdown I changed the "Allow Shutdown" Local to everybody but from time to time my option is set back to "Nobody".
Any idea.
Thanks in advance