Steve,

 

Just a thought, I noticed that the popup is using a hard or complete URL. I have had issues with this error when the session of the editor goes out of scope. Because you are not using a relative address I am going to make a guess an the session variable is gone on the popup. To see if I am right, open the include_security.asp file and add a

 

response.write "*" & Session("CESecurity") & "*"

before line 20

 

I think you will just see ** on the form

try changing your code to

var popupURL ="/admin/CuteEditor_Files/Gecko_InsertDocument.asp?UC=en-en";

and see if you have the same problem

 

RC