This reproduces only if the FlipDuration property of RadBook is set to 0. 

To work this around set the FlipDuration to a bigger value. For example: FlipDuration="0:0:0.001"

At the moment GIF images are not supported in SL RadRichTextBox

Users want to be able to resize columns of RadPivotGrid at runtime, similar to RadGridView.

This feature is available with our latest official version - R1 2019.

The regular ComboBox goes through all of the starting with the same letter items when pressing the same key multiple times. RadComboBox currently always highlights the first one.
In addition, the case where starting to type couple letters, will select the matched item with StartsWith

Here is the error:

Invalid XmlnsDeclaration occurs in assembly 'Telerik.Windows.Controls.GridView, Version=2018.3.1016.1050, Culture=neutral, PublicKeyToken=5803cfa389c90ce7'. XmlnsDeclaration references a namespace 'Telerik.Windows.Controls.MultiColumnComboBox' that is not in the assembly.

It is reproducible only in Visual Studio 2010 SP1.

Some documents containing embedded jpeg images with DCTDecode filter are not decoded correctly in RadPdfViewer for Silverlight

Allow users to expand properties of a complex type in order to reveal the list of that type's properties.

The feature will be available in R1 2019, scheduled for the mid of January 2019. 

JavaScript actions causes a script to be compiled and executed by the JavaScript interpreter. Depending on the nature of the script, the values of the interactive form fields in the document can be validated or updated or the visual appearances of the fields can be changed.

At this point not much else is known other than the stack trace. The stack trace suggests that this happens on selection done by dragging the mouse and perhaps the document is with incorrect structure.

When the user opens a dialog in RadRichTextBox, after closing this dialog, the focus is lost.

When a hyperlink is copy/pasted from MS Word to RadRichTextBox, only the display name is pasted and the hyperlink is lost.

The textblocks in PageSetup dropdowns in PageLayout tab have black foreground, when Expression_Dark theme is applied. The foreground color should be white.

If RadSpreadsheet is shown in RadWindow or in Popup, Filtering dialog throws NullReferenceException.

The reusable Form XObject content always resets its GraphicState color property. Instead, it should take the current GraphicState color from the content stream. This may result in wrong colors.

The character mapping cannot find the character with name "checkbld" and the glyph is not visualized.

The exception can be observed when printing document containing images with unsupported formats, or images with empty source (RawData = "").

The exception is with the following call stack:

   at Telerik.Windows.Documents.UI.HeaderFooterContainer.UpdateUI(SectionLayoutBox sectionBox, Boolean delayed)
   at Telerik.Windows.Documents.UI.HeaderFooterContainer.UpdateUI(SectionLayoutBox sectionBox)
   at Telerik.Windows.Documents.UI.DocumentPrintPresenter.MeasureOverride(Size availableSize)
   at System.Windows.FrameworkElement.MeasureOverride(IntPtr nativeTarget, Single inWidth, Single inHeight, Single& outWidth, Single& outHeight)


Workarounds:

If you click on print preview and print the document from the preview it is working;
     2. Use the following code

        this.radRichTextBox .PrintStarted += Rtb_PrintStarted;

        private void Rtb_PrintStarted(object sender, EventArgs e)
        {
            RadRichTextBox rtb = (RadRichTextBox)sender;
            foreach (var floatingImage in rtb.Document.EnumerateChildrenOfType<FloatingImageBlock>()
                                                      .Where(fi => !this.IsSupportedImageFormat(fi.ImageInline.Extension))
                                                      .ToList())
            {
                floatingImage.Parent.Children.Remove(floatingImage);
            }

            foreach (var inlineImage in rtb.Document.EnumerateChildrenOfType<ImageInline>()
                                                    .Where(i => !this.IsSupportedImageFormat(i.Extension))
                                                    .ToList())
            {
                inlineImage.Parent.Children.Remove(inlineImage);
            }
        }

        private bool IsSupportedImageFormat(string format)
        {
            return (format == "jpg") ||
                   (format == "jpeg") ||
                   (format == "png") ||
                   (format == "bmp");
        }   

The calculation of the left and hanging indent is incorrect for paragraph in list when the left and hanging indents are with the same value.