Clicking though on this thread:<URL:http://tech.slashdot.org/article.pl?sid=09/04/13/0120226&art_pos=1>, I encountered what appears to be a 1 pixel high, invisible link located beneath the title of the first comment. The link redirects to the URL provided on the first line of the comment.
I am running FF3.0.8 on a patched Ubuntu8.10 install/basic compiz effects. The buggy behavior and my D2 settings are shown in the attached screenshot.
Expanding/collapsing the comment does not seem to change this behavior, nor does resizing the browser window.
Screenshot of buggy behavior