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You configure a crawl to use the Crawl only the SharePoint site of each start address option for a content source in Microsoft Office SharePoint Server 2007. After you register a custom security trimmer, the value of the PluggableSecurityTrimmerId registry key is not updated.
This problem does not occur if you use the Crawl everything under the host name of each start address option for a content source.
The PluggableSecurityTrimmerId registry key is located under the following registry subkeys: