Index: contrib/auth/__init__.py
===================================================================
--- contrib/auth/__init__.py	(revision 5620)
+++ contrib/auth/__init__.py	(working copy)
@@ -12,6 +12,8 @@
         mod = __import__(module, {}, {}, [attr])
     except ImportError, e:
         raise ImproperlyConfigured, 'Error importing authentication backend %s: "%s"' % (module, e)
+    except ValueError, e:
+        raise ValueError, e
     try:
         cls = getattr(mod, attr)
     except AttributeError:
@@ -22,6 +24,7 @@
     from django.conf import settings
     backends = []
     for backend_path in settings.AUTHENTICATION_BACKENDS:
+        print backend_path
         backends.append(load_backend(backend_path))
     return backends