title: Redmine doesn't show related issues
body: <p>Redmine is kind of cool, but I have searched for hours now and can't get the <strong>related issues</strong> to work, not even as an administrator. The dialogue is just not showing up below the parent tasks in view or edit mode of an issue.</p>
  
  <p>Every user has the role manager, every user is assigned to all projects and the manager role has the permission to view and edit the issue-relations. However, they still don't show up.</p>
  
  <p>Did anyone experience the same issue when setting it up? Could it be related to a plugin?</p>
  
  <p>Best regards,
  Martin</p>