title: What does a Core Animation rendering error 506 mean?
body: <p>I've got this error on my device console log but I'm unable to find anything about it. I don't know what is the cause of this error, where to find any remarks or anything:</p>
  
  <pre><code>Tue Dec 14 09:46:05 unknown com.apple.SpringBoard[46] &lt;Notice&gt;: CoreAnimation: rendering error 506
  Tue Dec 14 09:46:05 unknown com.apple.SpringBoard[46] &lt;Notice&gt;: CoreAnimation: rendering error 506
  Tue Dec 14 09:46:05 unknown com.apple.SpringBoard[46] &lt;Notice&gt;: CoreAnimation: rendering error 506
  </code></pre>
  
  <p>This error happens randomly (and it's very rare) in my iPad application, basicly it makes a whole screen go black (for exception of buttons with images and some labels). When I exit the application I've got a blank spots (covered with black) on my virtual keyboard (so somehow it gets from application to iOS).</p>
  
  <p>Here is a video of this in action: <a href="http://www.youtube.com/watch?v=L2YilAVXqAo" rel="nofollow">http://www.youtube.com/watch?v=L2YilAVXqAo</a></p>
  
  <p>What can cause this and how can I avoid this error?</p>