Windows 2003 Server SP2, Domain Controller. Fully updated. This server is a test server for testing various applications and (Group Policies). It also has been updated to integrate with Windows Server 2008.

At some point, not sure just when it actually happened, I started seeing this message on the Settings tab for some of the Group Policy objects, in GPMC on the server:

"Display names for some settings cannot be found. You might be able to resolve this issue by updating the .ADM files used by Group Policy Management."

Instead of the name of the GP, it just shows the path to the GP. The GPs still are applied to client PCs, but what happened? Could this be due to the update for Win2008 or GPs for Vista clients maybe? Do I need updated ADM files for the server? If so, where do I get them from?