While waiting for C6, I installed an unsubscribed version of RHEL6, but it was troublesome to install packeges. So for those servers that were already installed, I switched them to SL6 without having to re-install, and it went great without a pain.
Did you perform a yum reinstall * or did you just update your repos?
I juste updated the repo and uninstalled some redhat packages :
rpm -e rhnlib rhn-client-tools rhn-setup yum-rhn-plugin rhn-check rhnsd redhat-indexhtml redhat-lsb
rpm -e --nodeps redhat-release-server-6Server rpm -hiv sl-release-6.0-6.0.1.x86_64.rpm
rpm -e --nodeps redhat-logos rpm -hiv redhat-logos-60.0.14-1.sl6.1.noarch.rpm
I did a test for yum reinstall *, and saw that 565 out of the 623 packages were to be re-installed, so I didn't want to get into problems with a remote server, I left it that way. I will do a reinstall on a server I got at the office, and I'll report back.