title: Joomla's jdoc:include has no output
body: <p>Preface: This question relates specifically to "modules" type jdoc:include tags. I'm running J!1.5</p>
  
  <p>So we've set up a series of template locations and mod_custom content blocks. Every other one of the content blocks are loading fine (e.g. the 'social' block, the 'recommendations' block'.)</p>
  
  <p>However, we are running into a problem with a content block we are loading in the head tag. The content it is supposed to be loading is a series of FB-specific opengraph meta tags. It simply doesn't show up. If I move the content to another position in the template, it is still ignored, though I can move OTHER content to the current position and it is fine. It seems to be just this content block.</p>
  
  <p>I've sanity-checked all the content &amp; template XML, cleared the caches, everything. Here's the command I'm using to render the content:</p>
  
  <pre><code>&lt;jdoc:include type="modules" name="head" /&gt;
  </code></pre>
  
  <p>I suspect there may be a keyword clash, but I can't find anything of the sort on the J! documentation.</p>
  
  <p>Any help or ideas would be greatly appreciated at this point.</p>