Thumbnails are not showing up

I am having a lot of trouble converting from FCKeditor to CKEditor. I beleive I have one problem left to resolve which is with CKFinder. The thumbnails are not showing up. It creates the folder under /UserFiles/_thumbs/Images + any subfolders but does not create the thumbnail files.

I am using the ASP version on a Windows Server 2003 and 2007 server. I have tried it with multiple browsers and all have the same problem.

The changes I have made from the default relate to paths. I change the baseUrl = "/UserFiles/" in config.asp, I also changed the subfolders to File, Image instead of Files, Images so it would work with the existing site.

In ckfinder\core\connector\asp\connector.asp i changed
<!-- #INCLUDE file="../../../config.asp" -->
to
<!-- #INCLUDE virtual="/ckfinder/config.asp" -->

I beleive I have the correct permissions on the folder otherwise the folders would not be created.

Your help would be most appreciated.

John