When TextOptions.TextFormattingMode="Display" is set on RadRichTextBox, incorrect Measuring causes TextBlocks to not visualize correctly.
Hi, The issue is fixed and will be live with our upcoming Q1 2015 release. Best Regards, Aylin, The Telerik Team
Workaround: set TextOptions.TextFormattingMode="Ideal" locally for the RadRichTextBox or for the TextBlocks in it: <telerik:RadRichTextBox> <telerik:RadRichTextBox.Resources> <Style TargetType="TextBlock" > <Setter Property="TextOptions.TextFormattingMode" Value="Ideal" /> </Style> </telerik:RadRichTextBox.Resources> </telerik:RadRichTextBox>