Cancellation Page is not rendered from email link

Hi

In the confirmation emails being sent to users I added the CANCEL code however when the user is clicking on the link they are taken to the home page and nothing happens. This is the example link they are shown in the email:

http://rynko.com/blog?app_cancel=1&app_id=8&app_nonce=7a122e6da5c9436f8221ee6b7be54e0b

Please confirm this is a bug?

Thanks
Tom