title: Elements on the canvas disappear w/ jsfiddle
body: <p>I have a problem using fabric.js in canvas. After resize with scale factor at 5x, clicking in ZoomIn 2 times, the elements on the canvas disappear. Please look: <a href="http://jsfiddle.net/ptCoder/Q3TMA/90/" rel="nofollow">http://jsfiddle.net/ptCoder/Q3TMA/90/</a></p>
  
  <p>Canvas size (just for example):</p>
  
  <pre><code>&lt;canvas id="c" width="400" height="400"&gt;&lt;/canvas&gt;
  </code></pre>
  
  <p>Zoom Scale Factor:</p>
  
  <pre><code>var SCALE_FACTOR = 5;
  </code></pre>
  
  <p>Is there any solution?</p>
  
  <p>Thank You.</p>