title: Media uploader "uploading" multiple instances of the same image
body: <p>When I select some images and drop into the wordpress file uploader, the first image of the group seems to upload correctly at this moment, while the others freeze and aren't being processed.</p>
  
  <p>However, after some time waiting, I've stopped the process, reloaded the browser tab, and at "Media" section, multiple instances of the same image, all of them with their respective ID by the way, are there, and are more instances than the number of images previously selected.</p>
  
  <p>Looking on FTP, on the upload folder, there are a large number of the same image that differ in a suffix that seems to be a counter of the number of files.</p>
  
  <p>Other odd thing that happens is that, even after logging out, some instances of the same file appears and the number keep growing.</p>
  
  <p>I have installed the following plugins and everything is fine, except for this odd behavior:</p>
  
  <ul>
  <li>Contact Form 7</li>
  <li>Custom Content Type Manager : Advanced Custom Post Types</li>
  <li>WooCommerce</li>
  <li>Maintenance</li>
  <li>Really Simple CAPTCHA</li>
  <li>WooCommerce Correios</li>
  <li>WooCommerce Extra Checkout Fields for Brazil</li>
  <li>WooCommerce PagSeguro</li>
  </ul>