Do you reproduce that with the latest version of RadEditor? Can you try using this demo (http://demos.telerik.com/aspnet-ajax/editor/examples/overview/defaultcs.aspx
) and see if you are able to reproduce the same?
If you cannot reproduce that with the online demo, I suggest you upgrading and see if that fixes the issue.
If not, maybe this stems due to some custom configuration or some custom solution. Are you using a custom content provided? If so, debug it and see if the code there fails for some reason.
Any further details on that would be helpful in order to further investigate the described behavior.
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