Perhaps you can run the group policy verification tool provided by Microsoft to help you determine the cause of the apparent administrator restriction.
Information, explanation and the tool download link can be found at:
http://www.microsoft.com/windows2000/techinfo/reskit/tools/existing/gpotool-o.asp
Microsoft Knowledge Base Article - Q250842 titled, "Troubleshooting Group Policy Application Problems" at the following link:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;q250842
There are various tools available that can help with GPO management. FAZAM 2000 provides analysis and management of Group Policy, and builds on Microsoft's native Windows 2000 infrastructure to provide greater manageability and control overGPOs.
http://www.fullarmor.com/solutions/group/
(Evaluation download available.)
Active Administrator allows administrators to manage Active Directory Security and Group Policies more efficiently.
http://www.smallwonders.com/activeadmin.htm
(Evaluation download available.)
Also, look at this link to an article that discusses creating group policy objects from the Group Policy MMC instead of from the ADUC snap-in.
http://www.rambuk.dk/Windows2000/fog0000000130.html
REMOVE SPACES from the pasted URLs.
I realize that this is not an exact answer, but perhaps these links will provide a helpful clue.