> > I also tried to remove all devel repos,
Note that they are "enabled=0" in your configuration files, which
means they are _disable_. No need to "remove" them.
Overlooked this. You're right.
> perform a "yum clean all" and
> > "yum update", but I still get the same errors.
>
> Nothing untoward there. Can you post the entire output of "yum update"?
mirrorlist=... is active, so any bad/out-of-sync mirror server
can lead to such symptoms. Suggest choosing a nearby and reliable
mirror instead of relying on mirrorlist=...
I have hope that onyl reliable mirrors would be kept in the mirrorlist?