Yum and public key issue

[Richard S. Crawford]

I'm trying to install a bunch of packages through Yum.  Unfortunately, for 
every single package, I get this error message:

public key not available for //var/cache/yum/kde-redhat-stable/packages/

Before y'all tell me to do rpm --import /usr/share/rhn/RPG-GPG-KEY-fedora, 
know that I've already done that.  I've also imported the fedora-test key.  
Still no joy.  

What's annoying is that this worked on this machine last night.  And it works 
on my other machine just fine.  The yum.conf files are identical on both 
machines, and have not changed on either machine since last night.  The only 
thing that has changed is that I've added .gnupg to my home directory, 
containing my various key files for GnuPG to work.

I've also run "yum clean all" in the hopes that would clear up something in 
the cache that might be causing the problem, but that didn't work.

I'm at a loss.  I've Googled quite a bit, but have found nothing beyond 
importing the key via rpm --import, which I've already done.
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