Is anyone actually able to follow this link and log in? I just get the username and password request but my forum login doesn't work so I never even see Mantis.
[Answer] You need your forum username/password to access the initial login page. If you are seeing http://bugs.introversion.co.uk/login_page.php, you need to create a new Mantis account. Click 'Signup for a new account' below the login page.