Even when I import the settings from a backed-up GPO into the defective one the "The server is unwilling to process the request." error still comes up when trying to delete the GPO.
The GPO's folder is created in sysvol\domainname\policy by the import and has the proper privileges set to it.

Will do some more googling and searching at MS.
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Mart

- Chuck Norris once sold ebay to ebay on ebay.