Yesterday, we released Review Board 1.6.11, which required the new Django 1.3.2 security release. Unfortunately, as some users have noticed, Django 1.3.2 breaks Python 2.4 compatibility. We have filed a bug against Django, but in the meantime, if you're using Python 2.4, you may need to downgrade back to Django 1.3.1.
To downgrade, first locate the Django-1.3.2*.egg directory in your Python path. Delete that, and then install 1.3.1 by doing:
$ sudo easy_install Django==1.3.1
We are hoping this will be addressed soon, at which point we'll update our 1.6.11 package with a hotfix that requires the new version.