Please download and install Fiddler
. Then inspect the requests from the Silverlight ReportViewer to the Reporting WCF service. Check also the server's Event Viewer for any error logs.
In general, the report will be rendered in XAML format, where images are elements with source set to an URL pointing to the service. If the image is not delivered the request for it will have status different than 200 OK. Test also exporting the report in PDF to verify it is processed and rendered as expected on the server.
We will be waiting for your update and the details from Fiddler - Inspectors - Request/Response - Raw
about the request for the image. Please include details for the used Telerik Reporting version as well.