My first suggestion is to make sure that you use the latest version 2010.3 1317 of RadControls for ASP.NET AJAX.
Can you please try the solution provided in the following PITS issue: http://www.telerik.com/support/pits.aspx#/public/aspnet-ajax/4889 ? It is to fire the the onParentNodeChanged() client method
of the RadEditor when the editor is shown on the page.
You can also try to register the external skins of the control just to make sure that the skins are fully loaded and this is not causing the problem. You can do that from:
- a CDN server: CDN
- or from external
css files: Registering an external skin of RadEditor
If the above suggestions do not help, please isolate the problem in a sample fully working project and send it for examination by opening a support ticket.
All the best,
the Telerik team
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