I recently encountered a problem with views in a SharePoint site collection – the values of the managed metadata column were not visible anymore for most users in the list views. However when the user edited the item or viewed the details of an item – they could see the value. Apparently this issue was caused as a side effect of migrating Windows users to claim users. For performance reasons, managed metadata (or taxonomy items) are stored at site collection level in a hidden list called TaxonomyHiddenList which is accessible at the root level of a site collection e.g. http://servername/sites/sitecollection1/lists/taxonomyhiddenlist. The list by default has read access to all Authenticated users but when performing the claims migration the security was mixed up, by giving all authenticated users read permission again, the issue was resolved.
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