ReportViewer control

I am attempting to create a custom control which simply displays a SQL Reporting Services report using the .NET ReportViewer control.  I created my control in SiteFinity, registered it and added it to a page, yet I am receiving a problem when the control shows the report parameters, starts to load but then simply gets stuck in the "loading" state and never displays the report.

I double checked all my code by simply recreating this same control in a normal Visual Studio web app and everything seems correct.  In the web app my report displays just fine, so it doesn't appear to have anything to do with my code or report permissions.  Instead it seems to have something to do with Sitefinity since that is the only difference. 

I also notice the below javascript error when the Sitefinity page loads.

Message: Object doesn't support this property or method
Line: 109
Char: 39
Code: 0
URI: localhost:8113/ScriptResource.axd

Any help would be appreciated.