Description of problem: Yum fails with the following error:
Downloading Packages:
Setting up and reading Presto delta metadata
Processing delta metadata
Package(s) data still to download: 645 k
fedora-security-guide-en-US-1.0-17.fc12.noarch.rpm                                                     | 645 kB     00:00     
Running rpm_check_debug
ERROR with rpm_check_debug vs depsolve:
rpmlib(PayloadIsXz) <= 5.2-1 is needed by fedora-security-guide-en-US-1.0-17.fc12.noarch
Complete!
(1, [u'Please report this error in http://yum.baseurl.org/report'])

I also get the following error on the GUI as a popup:
ERROR with rpm_check_debug vs depsolve:
rpmlib(PayloadIsXz) <= 5.2-1 is needed by preupgrade-1.1.0-3.fc12.noarch
Please report this error at http://yum.baseurl.org/report


Version-Release number of selected component (if applicable): 3.2.23-9.fc12


How reproducible: Everytime


Steps to Reproduce:
1. sudo yum install * or sudo yum update
2. see packages download
3. see fail
  
Actual results:
error messages

Expected results:
stuff installs

Additional info: I see this behavior in PackageKit as well.