Please look for the same topic in the forum for context. 
@Todor:
Am attaching the wmf file and png file that don't get rendered.

Possible workaround is to change the document of RadRichTextBox.

The fix will be available in our next LIB release (v. 2016.1.208).

Tab leader (dots) are calculated based on the available space between the end of the text in the entry and the page number. 

Workaround: to change rendering mode to TextBlockWithPropertyCaching:

this.radRichTextBox.TextRenderingMode = TextBlockRenderingMode.TextBlockWithPropertyCaching;

Workaround: Caret could be changed with custom implementation. More information could be found in this help article: http://docs.telerik.com/devtools/wpf/controls/radrichtextbox/ime-support#how-to-implement-your-own-ime-support

When a color property has default (auto) value, do not export a tag which points to omitted defintion in the color table. For example, if a span has transparent highlight (the default one), do not export the \highlight tag since this might lead to some incorrect rendering of the document from other readers - WordPad for example.

The issue is sporadic. Updating the UI resolves it.

Workaround: manually call
this.radRichTextBox.ActiveEditorPresenter.RecreateUI();
just after the acception.

Deleting a row in the attached table causes a crash during document layout.

It seems the height of the line is not properly calculated for specific fonts which leads to difference in the way the documents look. 

Document with one full page of text formatted with Arial Unicode MS looks shorter in RadRichTextBox.

When ParagraphProperties dialog is opened while several paragraphs are selected, the values in the dialog correspond to the values of that paragraph, where the cursor was placed before opening the dialog. Then if the dialog is closed with OK button, these values are applied to the other paragraphs as well.

In specific conditions, when selecting text through the document, NullReferenceException is thrown in RectPathBuilder class.

A "FontSize" setting cannot be applied to multiple paragraphs when the font size of the character at the beginning of selection is equal to the value which is going to be set.
Update: the issue is duplicate of http://feedback.telerik.com/Project/143/Feedback/Details/173836 .
The fix will be included in 2016 Q1.

1. Create a hyperlink before a section break.2. Remove this hyperlink by clicking on the context menu.

The fix is available in our latest official release 2014 Q3 SP1.

The fix is available in our LIB release (v. 2015.3.1123).

The Object pool is keeping a references to RadTextBlock and RadRun.