 I/O problem on Windows where system doesn't always return ENOENT when file is missing. [#18762]
            </p>
            </li>
            <li>
              <p>
 Fixed locking bugs: [#18789] 
</p>
              <div class="itemizedlist">
                <ul type="disc">
                  <li>
 Db-&gt;compact of BTREE with MVCC could return an unpinned page. 
</li>
                  <li>
 RECNO would fail to lock the next page when splitting a leaf page.
</li>
                </ul>
              </div>