I was able to reproduce the problem in your online demo: http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx
Steps to reproduce:
- Clear the content in the editor.
- In the font name dropdown, select "Tahoma".
- In the font size dropdown, select "20px". Note that the front name switched back to "Segoe UI" and font size is not retained.
I am running IE10.
Thanks.