http://docs.telerik.com/devtools/wpf/controls/radpdfviewer/document-model/exceptionhandling

The PdfPrintPreviewDialog should allow the end user to resize it and the page preview in it should scale accordingly. This would allow the user to have a better preview of the print settings.

To reproduce:

public Form1()
{
    InitializeComponent();

    radPdfViewer1.DocumentLoaded += radPdfViewer1_DocumentLoaded;
    radPdfViewer1.LoadDocument(@"..\..\TestDocument.pdf");
}

void radPdfViewer1_DocumentLoaded(object sender, EventArgs e)
{
    var pdfViewerElement = sender as RadPdfViewerElement;

    if (pdfViewerElement != null)
    {
        var myDocumentToPrint = new RadPrintDocument();
        myDocumentToPrint.AssociatedObject = pdfViewerElement;
        myDocumentToPrint.DefaultPageSettings.Margins = new System.Drawing.Printing.Margins(0, 0, 0, 0);
        myDocumentToPrint.Print();
    }
}
 
Please refer to the attached screenshots and sample pdf.

Workaround:  Specify the RadPrintDocument.DefaultPageSettings.Margins property on a way to have the right margin greater than 0 

When an image is actually consisting of a sequence of smaller images, sometimes white lines appear between the smaller images.

Add rotate view button.

To reproduce:
- Just show and close a form that contains pdf viewer with a loaded document several times. 

Handled InvalidDataException occurs while Zip Library tries to decompress wrongly decrypted stream.

Import documents that use this type of encryption. Currently, a handled NotSupportedEncryptionException with message "The encryption method with code 5 is not supported." is thrown while importing such a document.

Workaround: subscribe the RadPdfViewer control to the ViewerModeChanged event and in the handler, if the viewer mode is set to Pan, call the HideCaret method of the PdfViewerElement
private void radPdfViewer1_ViewerModeChanged(object sender, EventArgs e)
{
    if (this.radPdfViewer1.ViewerMode == Telerik.WinControls.UI.FixedDocumentViewerMode.Pan)
    {
        this.radPdfViewer1.PdfViewerElement.HideCaret();
    }
}

Workaround: update manually the RadPdfViewerNavigator.CurrentPageTextBox.