Subdomains shouldn't be an issue as our test site runs on a subdomain and our development pc runs on windows as well as under sub directories.

Is it possible to see the site and login - if possible to the back end? If you don't want to post feel free to email us at: info[AT]simplebydesign.co.uk

Again is attached another file - this time under debug mode it will leave the code used to redirect rather than hide the code, so you should see that the plugin is at least running.