Unicode Characters in page slug leads to a 404 error on a Network of sites

Hi!

I have a network of sites, one site for each language I’m gettinf the site translated into.

Some of the sites have problems, I think it’s because of Unicode characters in page slugs. Oddly, pages without special characters in the URl also have the same problem.

The site with the problem is at http://www.big-animals.com/pl

You can find pages using the search box, and there’s a page listed in the menu – however, clicking any link to a page produces a 404 error.

NB the pages were not created via the wordpress interface, but via a script, trying to grab the content that had been auto-translated by the GTS translation plugin.

mysql_connect(localhost,$usr,$psw);
mysql_select_db($dbs);
$result = mysql_query("SET NAMES utf8");
$sql = "delete from wp_5_posts where 1";
$res = mysql_query($sql);
$sql = "select * from wp_gts_translated_posts where language='pl'";
$res = mysql_query($sql);
while ($row = mysql_fetch_assoc($res)) {
  $insert = "insert into wp_5_posts ";
  $fields = "(post_author, post_date, post_date_gmt, post_content, post_title, post_excerpt, post_status, comment_status, ping_status, post_name, post_modified, post_modified_gmt, menu_order, post_type, comment_count)";
  $val = " values ";
  $values = "(1, '" . $row['created_time'] . "', '" . $row['created_time'] . "', '" . addslashes($row['post_body']) . "', '" . addslashes($row['post_title']) . "', '" . $row['post_excerpt'] . "', 'publish', 'open', 'open', '" . addslashes($row['post_slug']) . "', '" . $row['modified_time'] . "', '" . $row['modified_time'] . "', 0, 'page', 0)";
  $sql = $insert . $fields . $val . $values;
//  print($fields . "\n");
  print('moving ' . $row['post_title'] . ".....\n");
  $result = mysql_query($sql);
  print(mysql_error());
  print("\n");
}

mysql_close();

This script worked fine for French, Spanish, Italian, German… but not Polish… See http://www.big-animals.com/fr , for example.

I’ve tried the advice at http://semlabs.co.uk/journal/enabling-chinese-arabic-and-other-high-unicode-in-wordpress-slugs to no avail….

Help! Is there anything else left for me to try?