title: Wordpress - current-menu-item class missing
body: <p>In a custom template file I'm inserting one of my custom menus:</p>
  
  <pre><code>&lt;?php wp_nav_menu( array('menu' =&gt; 'Internal' ));?&gt; 
  </code></pre>
  
  <p>However the menu fails to generate the class current-menu-item for the current li item.</p>
  
  <p>I am inserting a menu in the same way for menus in other pages without any issues.</p>
  
  <p>What might cause Wordpress to fail output of the current-menu-item?</p>
  
  <p>Cheers
  Teodor</p>