title: Navigation bar with coloured translucency over a map
body: <p>I've a view with nothing but a map on it, inside a navigation controller.</p>
  
  <p>The navigation bar is translucent so the map can be seen slightly through it.</p>
  
  <p>This works fine with the navigation bar tint set to Default, but as soon as I change the bar tint to a specific colour the navigation bar background turns completely transparent.</p>
  
  <p>Interestingly, the issue doesn't happen in the emulator, only on an actual iPhone (a 4 (not S), in case that might be relevant).</p>
  
  <p>I've added no code yet- everything I've put together was generated purely in Interface Builder.</p>
  
  <p>Does anyone have any idea what might be happening here and what I might be doing wrong? Or is this a bug I need to report to Apple?</p>