Hi, I think polkit should own the directory /usr/share/PolicyKit/policy/ (and, of course /usr/share/PolicyKit/, too), which seems to be used by control-center and system-config-selinux. If the directory is incorrect, please file bugs against system-config-selinux (review bug #508922) and control-center.
control-center-2.28.1-8.fc12 has been submitted as an update for Fedora 12. http://admin.fedoraproject.org/updates/control-center-2.28.1-8.fc12
control-center-2.28.1-8.fc12 has been pushed to the Fedora 12 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update control-center'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/F12/FEDORA-2009-12078
control-center-2.28.1-8.fc12 has been pushed to the Fedora 12 stable repository. If problems still persist, please make note of it in this bug report.
This needs fixing in Fedora 13. control-center 2.30.1-1.fc13 has the .policy file in the old PolicyKit 0.9 location.