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When you have a fully licensed RTM version of MOSS 2007 running on a Server and you go to the Page Settings page and try to change the Page Layout from one to another I got this error:
After a bit of Googling, I discovered that this is a case of bad error message. To cut a long story short it comes down to a DCOM permissions bug. To fix it I had to add my MOSS app’s IIS Application Pool domain account to the local BUILTINAdministrators user group and then it all worked just fine.