Internet zonemapping problem

Hi

we are having problems with a certain group policy. We have a rather large environment, and have implemented a while ago, a group policy to centrally manage the Trusted Sites/Local Intranet sites:Windows Components/Internet Explorer/Internet Control Panel/Security Page

The GPO seems to be working well. The sites are recognized as stated in the policy.

Nevertheless, we get an error message in the event viewer:

Error 1085: The Group Policy client-side extension Internet Explorer Zonemapping failed to execute. Please look for any errors reported earlier by that extension.

With RSOP.msc I get this result:

Internet Explorer Zonemapping Failed (no data) 28/06/2011 15:33:11 Internet Explorer Zonemapping failed due to the error listed below.

The parameter is incorrect.

I can give you the list of all zone assignments if needed. We allready recreated it...

Davy