The problem below is now almost fixed and login and registration for comments and to the forums is now available again
However, at the moment, after login you will see an error 403 page as access is being blocked to the dashboard which is the default landing page. You are however logged in at this point and should click previous page on your browser and then page refresh to see the site.
As mentioned above dashboard access is, for the moment, being blocked due to the problems noted in the previous post. Thus you cannot change your password or customise your view of the site. This will hopefully only be a temporary restriction.