title: Django AdZone and problem in the admin
body: <p>im would like to use the cool app Django-AdZone, i thinks is a nice work , but i have a litter problem:</p>
  
  <p>i have 2 website, django-adzone is working very nice in one of those website, but in the second website is not working.</p>
  
  <p>I cant see in the django admin the app adzone, i dont know why, i did the same steps for both website, and the second website is not showing the adzone in the admin, the settings.py are similar with relation to adzone.</p>
  
  <p>Any idea?</p>
  
  <p>thanks guys</p>
  
  <p>sorry with my english</p>