Here's a traceback in case it helps: Environment: Request Method: GET Request URL: http://localhost:8000/kml/devices/testfilter/ Django Version: 1.5c1 Python Version: 2.7.2 Installed Applications: ('django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.sites', 'django.contrib.messages', 'django.contrib.staticfiles', 'mvw', 'django.contrib.admin', 'django.contrib.admindocs', 'django_tables2', 'django.contrib.gis', 'debug_toolbar') Installed Middleware: ('django.middleware.common.CommonMiddleware', 'django.contrib.sessions.middleware.SessionMiddleware', 'django.middleware.csrf.CsrfViewMiddleware', 'django.contrib.auth.middleware.AuthenticationMiddleware', 'django.contrib.messages.middleware.MessageMiddleware', 'debug_toolbar.middleware.DebugToolbarMiddleware') Traceback: File "/Library/Python/2.7/site-packages/django/core/handlers/base.py" in get_response 115. response = callback(request, *callback_args, **callback_kwargs) File "/Users/project1/code/mvw/mvw/decorators.py" in wrap 14. return f(request, *args, **kwargs) File "/Users/project1/code/mvw/mvw/views.py" in kmldevices 276. filter.graph = filter._build_graph() File "/Users/project1/code/mvw/mvw/models/filter.py" in _build_graph 110. for p in self.packets.filter(packettype__name = 'RSP'): File "/Users/project1/code/mvw/mvw/models/filter.py" in packets 180. query = query.authfilter(self.user) File "/Users/project1/code/mvw/mvw/models/managers.py" in authfilter 42. return self.filter(probe__client__user_set = user) File "/Library/Python/2.7/site-packages/django/db/models/query.py" in filter 655. return self._filter_or_exclude(False, *args, **kwargs) File "/Library/Python/2.7/site-packages/django/db/models/query.py" in _filter_or_exclude 669. clone = self._clone() File "/Library/Python/2.7/site-packages/django/db/models/query.py" in _clone 913. c._known_related_objects = self._known_related_objects Exception Type: AttributeError at /kml/devices/testfilter/ Exception Value: 'AuthQuerySet' object has no attribute '_known_related_objects'