I am upgrading from cute editor 6.3 to 6.6, using files downloaded from the DotNetNuke 5.x product download page.  The editor works in a testing environment for me in IE and FF.  When I migrate the upgrade to production, it works for IE (only tested in 8), but it gives an error in Firefox and does not load the editor.  The error message appears here (as shown in Firebug).  Any suggestions for resolution?