title: Unable to display Flash messages in Cakephp 3.x
body: <p>I am not able to get any Flash messages to display on any of my views.</p>
  
  <p>An example of trying to call a Flash message in controller (which is untouched from cake bake except for the message, syntax has stayed the same).</p>
  
  <pre><code>$this-&gt;Flash-&gt;success('Your Account has been created!');
  </code></pre>
  
  <p>In my AppController initialize function:</p>
  
  <pre><code>$this-&gt;loadComponent('Flash');
  </code></pre>
  
  <p>In my default layout:</p>
  
  <pre><code>&lt;?= $this-&gt;Flash-&gt;render() ?&gt;
  &lt;?= $this-&gt;fetch('content') ?&gt;
  </code></pre>
  
  <p>I am not getting any error messages, but as far as I can see and after doing lots of research about this issue everything seems to be set up correctly.</p>
  
  <p><a href="http://i.stack.imgur.com/rkZ7d.png" rel="nofollow">The Flash messages are visible in the session</a>, but only when I declare them with a key:</p>
  
  <pre><code>$this-&gt;Flash-&gt;default('A message... ',['key' =&gt; 'cutom_error_key',]);
  $this-&gt;Flash-&gt;success('Welcome',['key' =&gt; 'loggedin']);
  </code></pre>
  
  <p>I have made sure that valid flash .ctp files are in my Element\Flash folder (copied from another working project after running into this issue).</p>
  
  <p>Any ideas as to what is causing this issue?</p>