Donncha, This is an issue that has already been reported, but no solution found. On any domain mapped sites, when you try to upload an image via the media uploader, it looks like it uploads fine. When you try to insert the image into the editor, it gives all sorts of errors depending on what browser you are using. On FF, it’s just a blank media uploader and nothing is placed in the editor. On IE, you get an Error 2060 permissions error about not being able to access the javascript uploader. On Safari and IE, you also get the login page for the site in the media uploader window asking you to login. Any help would be great! Thanks!