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.
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed