Silverlight 5 vector printing sometimes fails unexpectedly when there are invisible elements in the visual tree. We are already in contact with Microsoft on this case, but meanwhile you can try to remove one of the UI layers that is possibly causing the problem. Just before printing, you could set custom UILayersBuilder
CustomLayersBuilder : UILayersBuilder
This layers contains the adorner shown when image is selected, and is used for image resizing. If this fits your case, you can permanently remove it with the mentioned technique.
If this doesn't solve your problem, we will appreciate sample project (attached to a support ticket) so we can try to create better workaround for your case.
Don't hesitate to contact us if you have further questions.
the Telerik team
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