I just installed the plugin and was setting it up when I noticed that SyntaxHighlighter plugin was not loading. I looked into the console logs and it seems that my the scripts at the bottom of my page (SyntaxHighlighter, Disqus, and a few others) are loading without jQuery or Underscore being defined yet. This doesn't happen when there are no pages that are selected to display related content in the "Layout Settings," but only seems to occur when the option is set to display in is_single.
I'm not sure exactly what the problem is, but the plugin itself seems to be working fine. I'm curious why it seems that it interferes with my normal loading of other scripts and/or jQuery itself. My site is http://blog.sklambert.com/. I've disabled the option for now so that SyntaxHighlighter will load properly.