No packages were installed

Just happened:

Now updating kernel-headers ..

Installing package(s) with command yum -y install kernel-headers ..

Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* addons: mirrors.liquidweb.com
* base: mirrors.combinetworks.com
* centosplus: mirror.sanctuaryhost.com
* contrib: mirror.sanctuaryhost.com
* extras: mirror.sanctuaryhost.com
* updates: www.cyberuse.com
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package kernel-headers.i386 0:2.6.18-164.10.1.el5.centos.plus set to be updated
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
Package Arch Version Repository Size
================================================================================
Updating:
kernel-headers i386 2.6.18-164.10.1.el5.centos.plus centosplus 1.0 M

Transaction Summary
================================================================================
Install 0 Package(s)
Update 1 Package(s)
Remove 0 Package(s)

Total download size: 1.0 M
Downloading Packages:
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Updating : kernel-headers 1/2
Cleanup : kernel-headers 2/2

Updated:

Complete!

.. install complete.

No packages were installed. Check the messages above for the cause of the error.

Obviously yum reported that it installed fine, but Virtualmin is a little confused =)