Review Board 1.6.11 is out, with some fixes to regressions in 1.6.10 and further optimizations If you're running 1.6.10, you'll want to upgrade.
We also are now requiring Django 1.3.2. This is a security release that the Django project put out yesterday. We recommend that all Review Board 1.6.x users upgrade to this release. If you're not intended to upgrade to 1.6.11 right away, you can upgrade Django by typing:
$ sudo easy_install Django==1.3.2
You can read more about the security releases.
Full release notes are available.