File Uploader - "Permission denied to get property Window.On

Hi,

I've the latest releases of the fckEditor and fckEditor.net (FCKeditor 2.6.4, .NET Assembly 2_6_3)
Having an issue with the fileuploader, similar to: (my image uploader is working though)
viewtopic.php?f=6&t=12112

When I try and upload from a link in Firefox and IE the upload window hangs forever. The FF window in the error console displays:
"Error: Permission denied to get property Window.OnUploadCompleted"

So I tried the steps here:
on line 118 in FileWorkerBase.cs changed: window.top.opener.document.domain to window.parent.OnUploadCompleted
also tried window.top.opener.document.domain to window.parent.document.domain.

Instead of the Javascript error. I get an "Invalid Request" error, if I use either of those.

Any help would be appreciated.

Thanks in advance.

- Matt