Hi, sorry for my english
The problem that have @kokohv is that the collation of the phpbb database is different from utf8. The solution is to write the following line before submit a query to the phpbb database:
@mysql_query('SET CHARACTER SET UTF8', $cn);
I added it in widget-posts.php before:
$rs = @mysql_query ($qr, $cn);
and the problem was solved.
I hope I have helped.