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

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.

The colors are different everytime the file is opened in the viewer.

Available in R1 2017 Release

Italic bullet sign of bulleted paragraph (with last italic characters) is exported like an equal sign with a line through it.

Workaround: Make all italic bullets non-italic. The following code achieves that:

RadDocument document = this.radRichTextBox.Document;

foreach (var paragraph in document.EnumerateChildrenOfType<Paragraph>())
{
    if (paragraph.ListId != Paragraph.ListIdProperty.DefaultValue)
    {
        DocumentList documentList = document.ListManager.GetDocumentListById(paragraph.ListId);
        int levelIndex = paragraph.ListLevel != Paragraph.ListLevelProperty.DefaultValue ? paragraph.ListLevel : 0;

        if (documentList.ActualStyle.Levels[levelIndex].NumberingFormat == ListNumberingFormat.Bullet)
        {
            documentList.ActualStyle.Levels[levelIndex].SpanProperties.FontStyle = FontStyles.Normal;
        }
    }
}

this.radRichTextBox.UpdateEditorLayout();

When entering header, the focus is moved to the footer. When entering footer, focus goes to the main document editor, comment editor (if comment is present), or footnotes/endnotes editor (if footnotes/endnotes are present). Sometimes the focus is moved to the Font combo box in the Ribbon UI.

When inserting symbols in the header, some of them are inserted in the footer.

The character is rendered with different glyph geometry and wrong glyph width which results in overlapping text.

As a workaround inherit RevisionsToolTipLayer and override ResetPooledElementProperties method

 protected override void ResetPooledElementProperties(object element)
        {
            if (element is Path)
            {
                Path path = (Path)element;
                path.Data = null;
                path.Fill = null;
                path.Dispatcher.BeginInvoke(()=>
                ToolTipService.SetToolTip(path, null));
            }
        }

When color is applied to table cell border through the Table Borders -> Cell Borders, the thickness of the border is set to 0. This makes the border invisible.

Workaround: Change the border thickness manually in the dialog after the color is changed.

Steps to reproduce:
- Add table with one column
- Open from context menu Table Borders dialog
- Click on Cell Borders tab 
- Apply color -> blue
- Press OK

Expected: The table cell has blue borders applied.
Actual: The table cell has no borders.

The borders of a row spanned (merged) cell are not correctly imported if the borders are applied before the merge.