Reporting Services Print from SharePoint: "Unable to load client print control"

In an enterprise environment that doesn't allow users to download ActiveX controls, the printing of reports from within SharePoint may not work correctly as the IE Browser cannot load the client print control.

We attempted to install the RSClientPrint.cab manually and register the DLLs but that didn't work. Even creating a new MSI file did not work. Finally, after going through various steps, we were able to allow the ActiveX controls to be silently installed within the locked-down environment. In order for the steps below to work, any group policy must "Allow download of signed ActiveX controls". This was confirmed to be resolved using IE 6.0, 7.0, & 8.0.

Here is the summary of our troubleshooting for issue “Unable to load client print control” :

1. When we tried to print any report from Sharepoint Integrated Reporting Services, we got an error “Unable to load client print control”.
2. We checked that Reporting Services is on 9.00.3042 (SP2) version.
3. Upgraded Report Server with Security Update for SQL Server 2005 Service Pack 2 (KB954606) : http://www.microsoft.com/downloads/details.aspx?familyid=4603C722-2468-4ADB-B945-2ED0458B8F47&displaylang=en
4. That went successful and Report Server version changed to 9.00.3073
5. Then we installed the updated version of the SharePointRS.msi on all Web Front Ends in the SharePoint farm. The new version of the add-in can be found here: http://www.microsoft.com/downloads/details.aspx?FamilyID=1e53f882-0c16-4847-b331-132274ae8c84&DisplayLang=en
6. Verified that the Microsoft.ReportingServices.SharePoint.UI.WebParts.dll has been updated to the correct build of 9.00.3294 by looking at the version of this file in the C:\windows\assembly folder.
7. Now users are able to print the report