Please check the browser console to see if there are any resources or services that cannot be loaded. As Rado mention, we use Silverlight and most probably ClientBin/Telerik.Sitefinity.Silverlight.xap
cannot be opened at your end
- the xap file is not in the specified location
- you do not have mappings
- something at your end blocks the request to the xap file
- you do not have Silverlight installed on your browser.
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