display block save_block_cache doesn't handle blocks with md5 bid

   */
  function save_block_cache($delta, $cache_setting) {
    if ($bid = db_query("SELECT bid FROM {block} WHERE module = 'views' AND delta = :delta", array(
        ':delta' => $delta))->fetchField()) {
      db_update('block')
        ->fields(array(
        'cache' => $cache_setting,
        ))
        ->condition('module','views')
        ->condition('delta', $delta)
        ->execute();
    }
  }
}

As you see if $delta = md5($delta) this basically fails.