here's the rest of what's missing from my question:
In every version that we have of DotNetNuke (including the latest version that comes with FCK as a default), we cannot get it to work at all. When you click on the "Rich Text Editor" radio button, you get a bunch of html code starting with:
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
* FCKeditor - The text editor for Internet -
http://www.fckeditor.net * Copyright (C) 2003-2008 Frederico Caldeira Knabben
*
etc.....
We do not see the toolbar or any kind of control. Just a textbox.
I'm guessing that it's some kind of setting on IIS or Folder setting since it doesn't work on 3 separate instances of DotNetNuke, including the latest (Version 5.14). We can get it to work on our local dev server.