I had both Fedora Core 6 & Fedora 7. I learned very quickly that it was necessary to only do updates once a week, usually Saturday night. But just before doing updates, if I was satisfied with it's performance I would backup the entire system. When these sort of events would pop up I would erase the entire installation and load the image of it before the updates and work out the problem. Turned out to be the best way to update Fedora. Details can be found in this
thread, if you're interested in protecting yourself from the effects of bleeding edge Linux distribution's updates.