title: Drupal 7 file system error: The directory sites/default/files exists but is not writable and could not be made writable
body: <p>I'm copying a Drupal 7 installation from one machine to another. Both machines are Mac OSX running current versions of MAMP. Procedure as follows:</p>
  
  <ol>
  <li>create sql dump file</li>
  <li><code>rsync -ar path/to/source path/to/destination</code></li>
  <li><code>chmod -R 755 destination/sites/default/files</code></li>
  <li><code>chown -R username destination</code></li>
  <li>import sql dumpfile</li>
  <li>adjust settings.php (actually, they remain the same across environments, but just checking db connect info and $base_url.)</li>
  </ol>
  
  <p>Everything works here, on the destination side, except that the sites/default/files directory can not be made writable[sic]. Something in the directory tree and/or permissions is changing, but I can't figure out what/how. What gives?</p>