Is it possible that this issue effects Differential but only for inline-comments that have been ported forward from a previous diff (i.e. the ones that are rendered as slightly faded). I see this issue on this instance with this revision: https://secure.phabricator.com/D15675, none of the anchor links in the timeline work for me when I use Chrome 55, but I don't see the same issue on reviews where comments are on the most-recent diff (not faded).