title: CFPDF thumbnail problem not showing background/images
body: <p>I have 2 pdf's i'm running through CFPDF action="thumbnail".
  The first pdf returns a perfect looking thumb.
  The second returns a thumb with only the text and background colors, but NO background or foreground images.  I didn't create these PDF's, I can't tell a difference in the two.</p>
  
  <p>Here's the code, simplified for testing purposes:</p>
  
  <pre><code>&lt;cfpdf action="thumbnail" source="First.pdf" destination="thumbnails" overwrite="yes"&gt;
  &lt;cfpdf action="thumbnail" source="Second.pdf" destination="thumbnails" overwrite="yes"&gt;
  
  &lt;img src="thumbnails/First_page_1.jpg"&gt;
  &lt;img src="thumbnails/Second_page_1.jpg"&gt;
  </code></pre>
  
  <p>I can send the pdfs in question if necessary, but would rather not post them here for obvious reasons.</p>