title: Problem when using \LaTeX \includegraphics with some PDF files
body: <p>I noticed some strange effects when including existing pdf graphics in my laTeX documents:</p>
  
  <p>Most file work flawlessly, but some PDFs that were created on a different machine (or from the web) cause the whole page on which they are embedded to become ever-so-slightly distorted. I only notice the difference in a side-by-side comparison, but once you see it, it's obvious. The text layout seems slightly broken, and when you zoom in you can see it better.</p>
  
  <p>I will try to make some screenshots to further elaborate, but in the meantime: </p>
  
  <p>Has anyone seen this before and how can I get rid of these distortions?</p>