Hello,
If you experience the problem in Firefox only, see this forum thread on the subject:
RadEditor for ASP.NET does not work properly in Firefox 6. If the version of RadEditor.NET2.dll is older than 7.x.x, e.g. 6.x.x. you should upgrade to 7.3.6 and use the solution provided in the forum thread above.
Of course the recommended approach is to migrate to
RadEditor for ASP.NET AJAX, because RadEditor for ASP.NET is discontinued since 2009 and it does not support the modern browsers.
Greetings,
Rumen
the Telerik team
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