translations in version 1.1.1

What does your directory structure look like? It should look something like this:

/lang/en/
/lang/fr/
/lang/nl/
etc.

It almost sounds as if you placed the language pack PHP scripts directly into the lang directory.

Have you made any modifications to any of the language files? I'm thinking it might be this problem.

this is my config.php file, may be this can help?

<?php

$db_type = 'mysql';
$db_host = 'localhost';
$db_name = 'mypunBB';
$db_username = '*****';
$db_password = '*****';
$db_prefix = 'punBB_';
$p_connect = true;

$cookie_name = 'punbb_cookie';
$cookie_domain = '';
$cookie_path = '/';
$cookie_secure = 0;

$language = 'en';

define('PUN', 1);

?>