Review Board 1.7.22 is out. It's primarily a bug fix release, with an important security update (particularly for public installations).
An XSS vulnerability was reported that we've patched that involves the Search field. If you're running a 1.7.x release, we recommend updating to 1.7.22.
There's also a large number of bug fixes in this release. We've been working hard on going through the bug tracker and fixing up as many bugs as we can. This includes Git diff parsing fixes, compatibility improvements for Mercurial configurations, easier support for enabling HTTPS, and more.
See the release notes for the complete list of fixes.