one word: "Security".... http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconxsltransformclassimplementsxsltprocessor.asp[^] "Most of the Load methods also take Evidence as a parameter. The Evidence parameter is the System.Security.Policy.Evidence that is associated with the style sheet. The security level of the style sheet affects the security level of any subsequent resources it references, such as the script it contains, any document() functions it uses, and any extension objects used by the XsltArgumentList." I had the same problem... :mad: "When the only tool you have is a hammer, a sore thumb you will have."