title: django-registration activates user but shows error
body: <p>I'm using django-registration which somehow stopped working the way it should work. I'm completely lost on this and have no idea where to start looking for the error.</p>
  
  <p>So what happens is, that whenever a user clicks on the activation link, he gets the activation.html template. Which should only be shown when there was an error.</p>
  
  <p>But actually there is no error. The user gets activated and can log in.</p>
  
  <p>Any thoughts on this will be greatly appreciated.</p>