Hi Nathan,
Please, note that version 5.4 or later of
DNN uses the Professional provider of RadEditor, which is implementation of the
DNN developers and it is not supported by Telerik.
Our suggestion is to post your question in the
DNN forums and contact the support of DNN for help. This article could be also helpful :
Taming (customizing) The new Telerik RadEditor.
Kind regards,
Dobromir
the Telerik team