cobbler reposync

Hello, After using 'cobbler reposync' I always need to do a 'yum clean all' on the client before the updates are visible. We use cobbler-2.0.5-1.el5 & cobbler-web-2.0.5-1.el5. In /etc/cobbler/settings I've got the following createrepo settings; createrepo_flags: "-c cache --update -C" The 'cobbler reposync' syncs to a local repository which is updated with 'createrepo --update .' Any ideas why 'yum clean all' is necessary? Regards, Stefan Informatie van de Raad voor de rechtspraak, de rechtbanken, de gerechtshoven en de bijzondere colleges vindt u op www.rechtspraak.nl.