Using WPF4's TextOptions.TextFormattingMode="Display" to improve overall text clarity seems introduce rendering artifacts with the RadRichTextBox as shown in the screenshot. Since in my opinion TextOptions.TextFormattingMode="Display" greatly improves the overall impression of a WPF app it would be nice if the RadRichTextBox would handle this correctly.
http://www.flickr.com/photos/47457340@N06/5914179061/
http://www.flickr.com/photos/47457340@N06/5914179061/