The support and development of RadEditor Classic is discontinued since 2009 and we do not provide hotfixes for it. We strongly recommend upgrading to RadEditor for ASP.NET AJAX, which offers support for all modern browsers, many new features and improvements, and multiple bug fixes.
My suggestion is to test the Default Example
of the latest available version 7.3.6 of RadEditor Classic and if the problem exists, to migrate to the latest official build of RadEditor for ASP.NET AJAX. You can find migration instructions in the following article: Migration from RadEditor Classic to RadEditor for ASP.NET AJAX
the Telerik team
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