I have a quite weird problem. If I install dashboard app, drop the database and create it again with syncdb, then i'm not able to log in the admin (when I type the admin user and password and press the button, the login screen appears again, without any error message).
I have a workaround, that is a) comment the dashboard app in settings.py b) drop and recreate the database c) uncomment dashboard and do again the manage.py syndb. Then, the admin login works perfectly.
I have absolutely no clue of what is happening here. I have even debugged the django admin's login view, but i'm not able to understand why does it fail, or why does it fix with this workaround. But I have replicated the problem in several computers and browsers, and it's consistent.
I have Django 1.3.