Thread:Extension talk:CodeReview/review comments aren't threading

I just installed a recent snapshot of CodeReview in my wiki, and I noticed that the review comments are not getting properly nested.

I see that review comments on this wiki seem to be nesting properly (or, at least, used to). for example: http://www.mediawiki.org/wiki/Special:Code/MediaWiki/81528#code-comments) Is there a configurable parmater that controls this?