title: CCShaky3D turns the background black
body: <p>I'm trying to make my sprite have a shake effect. However, while the sprite does shake, the entire background turns black. Can anybody help me with this?</p>
  
  <p>Here's the code that I've written to add the sprite to my layer along with the action that I run right after.</p>
  
  <pre><code>CCSprite * picture = [CCSprite spriteWithFile:@"picture.png"];
  picture.position = ccp(winsize.width/4,
                         picture.contentSize.height * 0.8);
  [self addChild:picture];
  CCShaky3D * shake = [CCShaky3D actionWithRange:4
                                          shakeZ:NO
                                            grid:ccg(12, 12)
                                        duration:0.5];
  [picture runAction:shake];
  </code></pre>
  
  <p>Can anybody help me?</p>