Hi Ji Kai
I think you are experiencing a known issue with the RadEditor for MOSS and multiple WFE servers.
If you are using version 5.x (full featured), then please upgrade to version 5.22 where this problem is fixed. You can get the latest version from the RadControls for ASP.NET AJAX downloads page in the Client.Net website.
If you are using version 4.x (lite or full featured), then you need to make sure the RadEditorList.ascx
file is in the \Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\CONTROLTEMPLATES\
folder on both WFEs. If it is present only on one of them, copy it to the other one and run IIS reset.
the Telerik team
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