Authorization errors in new F19 install

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http://forums.fedoraforum.org – I am having problems where I am not being prompted for a password when I should be. For example if I run Users and Groups from the menu I dont get prompted and it just does not start, however if I run system-config-users in a console I get prompted for my user password and the program starts OK. This is happening all over the place. My user is a member of the wheel group and I have SELinux disabled. This is a new install using an existing /home directory. Anyone any ideas please? Stuart (HowTos)