Enable modules / when parent "OK", all modules are desabled.

I try to explain in english because it's very strange.

When :

1- I enable module
2- Drupal tell me : "to enable this module (x), you must enable module "y". Are you agree ?" something like that. I click "OK".
3- Drupal tell me : "to enable this module (y), you must enable module "x". Are you agree" ?" I click "OK"
4- Drupal ask me the same thing point "2"... I click Ok, and repeat point 3, and repeat, repeat, repeat. (this is the first problem).
5- After I click on CANCEL, Drupal come back to all modules, BUT all modules are DESABLED (forum, etc etc).

To resole this, at the question 2, I click on "ROW LEFT" on Firefox, and enable the depend module, etc etc... Very long but resolve point 4 and point 5.

Last information : with Imagmagick or GD, it's the same thing. With ou without fck, too.

I hope to help you with this problems description ;-)

My config :

Drupal 6.11

GIF Read Support, GIF Create Support, JPG Support, PNG Support, WBMP Support, XPM Support, XBM Support, FreeType Support with freetype
Accès au fichier update.php Protégé
Base de données MySQL 5.0.44
Boîte à outils image The imagemagick toolkit is installed.
CAPTCHA Already 76 blocked form submissions
Etat de mise à jour de Drupal core A jour
FCKeditor Inconnu
You are using a feature that requires manual integration into config.php (either built-in filebrowser or quick uploads are enabled in the Default profile). Read instructions about enabling built-in file browser and add "require_once ..." statement in editor/filemanager/connectors/php/config.php.
Fichier de configuration Protégé
Image import Import directory sites/default/files/images/import exists.
Image module directories Exists (sites/default/files/images).
ImageMagick advanced options ImageMagick image toolkit is selected.
Librairie Unicode Extension PHP mbstring
Memcache 1.2.6
Memcache admin Memcache included
Mise à jour de la base de données A jour
Notification des mises à jour Activé
PHP 5.2.5-pl1-gentoo
PHP 'register globals' Désactivé
Plafond mémoire de PHP 600M
Serveur web Apache/2.0.59 (Unix) mod_ssl/2.0.59 OpenSSL/0.9.8g
Statut de mise à jour des modules et thèmes A jour
Système de fichiers Inscriptible (méthode de téléchargement privée)
Tâches de maintenance cron Dernière exécution il y a 7 min 34 sec
Vous pouvez lancer le cron manuellement.
Zlib library Activé
jQuery UI 1.5.3
jQuery Update 1.2.6