I would recommend several things:
- check whether you are using the latest Silverlight 4 RTW (the plugin version should be 4.0.50401.0)
- check whether you are using the latest Telerik assemblies for Silverlight 4. You could download them from here:
if the above does not help, please, open a new support ticket and send us a simple application that demonstrates the problem. We will do our best to help as soon as possible.
the Telerik team
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