Hi, The issue is fixed and is included in our latest LIB with version 2016.1.302. Do not hesitate to contact us if any issues arise. Best Regards, Aylin, The Telerik Team
We catched exception in RichTextBox after specific HTML fragment importing (Telerik.Windows.Documents.dll, explicit cast to Span in the method RecalculateParagraphFontSize). Please, fix it, it so easy!