title: Drupal messages being lost on form redirect
body: <p>I'm trying to print a message when a user registers. I created a form submit handler which calls drupal_set_message and returns '/'. I put a watchdog message in my submit handler to ensure it was being called, and it is.</p>
  
  <p>After the redirect I'm getting no messages though. My debugging dpms from devel don't work, my drupal_set_message doesn't work, etc. The template that's being used definitely is printing $messages.</p>
  
  <p>I checked out the very similar question but it doesn't seem to apply. My user 0 exists and it's also quite an old answer.</p>
  
  <p>Any help is appreciated!</p>