It appears that the CuteEditor is not loading the correct loader files. The browser is IE8 running on Windows XP Pro but it is trying to load the Gecko_Loader file.
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET CLR 1.1.4322)
Message: 'HTMLElement' is undefined
Line: 3
Char: 22616
Code: 0
URI: http://..../Editor/Load.ashx?type=scripts&file=Gecko_Loader