Review Board 1.6.13 is out, and with it comes a bunch of nice little bug fixes.
A couple of the highlights have to do with the new incremental diff expansion feature. There were problems in the diff headers shown in e-mails, and the expansion links for certain function/class headers, which are now fixed in this release.
There's also a number of other fixes for several other bugs across the product.
See the release notes for more information.