up2date problem?

[glenn]

Just installed a new RHEL AS3 server.  It won't complete up2date 
now, even though it did when first run.  Fifty-some-odd packages 
are downloaded, but install fails with this message:  "Package 
mod_authz_ldap-0.22-3 is already installed."  True enough, but 
this is the version included on the AS3 CDs from RedHat.  Why 
would up2date try to install an earlier version, listed as 0.22?  
And why would that prevent the other fifty packages from being 
installed?  Should I put mod_authz_ldap in the list of updates 
NOT to download, or might this screw up something else?  
Thanks.   -Glenn.