The table layout is slow with documents that contain large tables. This causes slow import and later slow performance with such documents.

Currently, working with bookmarks and cross references in the headers and footers of a document is not supported.

The caret of RadRichTextBox appears only when the text is selected. Once you try to reorder the letters within its content, it appears.

The issue is caused when ScrollViewer control has different than the default style for the corresponding theme and there are set Padding and/or Margin properties. 
Workaround: the template of the Caret should be edited and Style="{x:Null}" should be set on the ScrollViewer which is defined inside the Caret control template.

Actually, when we go to image editor from the RadRichTextBox, we've got the original image's size but not the width and height in the document. When we need to format pictures of a document with equal size, we are using the document's size, not the picture's size.

Thanks 

The fix will be available in the next official release Q1 2015.

When there isn't space for the first non-repeated row to be drawn on the page, the repeated rows should not be repeated on each page where the table spans - they should be drawn only on the first page (the page where the table begins). 
 
However, currently the requirement described above is not satisfied and the first repeated row is drawn on every page, where the table spans, which is not correct according to the Office Open XML specification. 

Create document with some text.
Insert image.
Right click on image and add hyperlink to it.
Drag the image somewhere in the text.
Observe that it is created a copy of the image. 

Actually, the issue occurs when the hyperlink is inserted.

Workaround: Manipulate the clipboard content in CommandExecuting even handler:

private void RichTextBox_CommandExecuting(object sender, Telerik.Windows.Documents.RichTextBoxCommands.CommandExecutingEventArgs e)
{
    if (e.Command is PasteCommand)
    {
        DocumentFragment document = ClipboardEx.GetDocument();
        bool hasChangedDocument = false;

        foreach (FieldRangeStart fieldStart in document.EnumerateChildrenOfType<FieldRangeStart>())
        {
            foreach (Span span in fieldStart.Field.GetFragmentByDisplayMode(FieldDisplayMode.Code).EnumerateChildrenOfType<Span>())
            {
                span.ForeColor = Colors.Black;
                hasChangedDocument = true;
            }
        }

        if (hasChangedDocument)
        {
            ClipboardEx.SetDocument(document);
        }
    }
}

Images with display: none could be made not-visible in the UI. The other elements could be skipped and not imported.

When header/footer (HeaderFooterPresenterBase) is rendered, the model which corresponds to it (HeaderFooterBase's Body property) is not updated. The result is updated only in the presenter. Thus, when exporting the document or when checking the elements in the model, the value of the inline (span's text) is not updated.

Workaround: Update the fields in the headers/footers. RadDocumentEditor.UpdateAllFields() method can be used. Note that it works only for the main document and not its child documents, so different RadDocumentEditors should be created for each header/footer document.

When exporting RadDocument to HTML comments are omitted. 

MS Word, for example, adds comments as end notes using JavaScript.

Implement generating of an image and inserting it into the clipboard on copy/cut so it can be pasted in MS Paint or other tools for image editing.

Attaching to the CommandExecuting event of RadRichTextBox and handling the copy command can be used as a workaround:
CopyCommand command = e.Command as CopyCommand;
  
if (command != null)
{
    ImageInline image = this.radRichTextBox.Document.Selection.GetSelectedSingleInline() as ImageInline;
    if (image != null)
    {
        Clipboard.SetImage(image.ImageSource);
        e.Cancel = true;
    }
}

Currently, colors with alpha channel defined with 'rgba' function are not supported, for example the following:

<span style="background-color: rgba(0, 0, 0, 0.5);">Some text</span>

is imported as black color; semi-transparent colors are exported without the alpha channel.

There are some special characters in the Polish alphabet, which are inserted with key combinations - AltGr + E should insert "ę", Alt Gr + L should insert "ł". These combinations are overridden in RichTextBox because are triggering default commands in Silverlight.
 

Workaround: Attach to the PreviewEditorKeyDown event:

HtmlFormatProvider cannot import a document that contains an image with invalid URI format. An UriFormatException is thrown and the whole import fails. Similar errors should be handled and the document should be imported.

A bullet list cannot be removed when pressing the toggle on/off button in the ribbon when a new line is also selected.

Currently, the CheckBox SDT doesn't support editing, compared to MS Word where you can change its font and other settings. Add support for this in RadRichTextBox.

If span formatting command (bold, italic, strikethrough) is applied to selection over multiple paragraphs, and tracked with tracked changes; and later this tracked change is rejected, NullReferenceException is thrown. The exception is handled so the visible result for the end user is that the UI stops updating and any subsequent changes are not visible.