http://blogs.msdn.com/mariae/archive/2008/12/11/unable-to-load-client-print-control-error-in-reporting-services-2005-after-installing-kb956391.aspxYou might receive the following error when trying to print a report in Reporting Services after the installation of KB 956391 on the client machines: Microsoft Security Advisory: Cumulative security update for ActiveX http://support.microsoft.com/?id=956391en-USCommunityServer 2.1 SP1 (Build: 61025.2)