title: Poedit is not working after update to v2.0
body: <p>I've just updated Poedit to the currently newest version 2.0 (4948). Now I'm observing two issues on with update of the source strings (button <kbd>Update</kbd>):</p>
  
  <ul>
  <li>No new source strings are added to the list -- they seem just to be ignored.</li>
  <li>If I remove a string, this is also ignored -- the string remains in the *.po file.</li>
  <li>Many strings (first of all the strings starting with a varialbe like <code>%s</code>) disappear.</li>
  </ul>
  
  <p>How to get it working correctly again?</p>
  
  <hr>
  
  <p><strong>EDIT</strong></p>
  
  <p>Just downgraded Poedit (removed v2.0 and installed v1.5.7), but the issue is still there. So obviously it's not a version 2 problem. (Though I let the question title unchanged, since it might be an updated related.)</p>