I have a XSLTListViewWebPart on a page and it is linked to an XSL stylesheet located in the Style Library. Anonymous users have read access to the Style Library. When a logged in user views the page, the XSLTListViewWebPart works fine. However, when an anonymous user views the page the XSLTListViewWebPart gives the following error message:
Access denied. You do not have permission to perform this action or access this resource.
This seems to be a permission issue, but anonymous users should already be able to access the XSL stylesheet.