Thank's a lot

This just means that the config for your LDAP source can't list users. 
Please use the mailing lists (http://horde.org/mail/) for support - 
there are some good LDAP people there.

All runing corectly exepte when I activate LDAP authentification.



Here is a copy screen of the result

http://img143.imageshack.us/img143/8513/screenhorde321cv7.png



With LDAP authentification, the field type:[text] become a field 
type:[dropdown list].



Here the source code of the page (in french, sorry for that):



---------------------------------------------

<h1 class="header">

  <img src="/horde31/themes/graphics/user.png" alt="" title=""> 
Ajouter des membres</h1>

<select name="new_user[]" multiple="multiple">

</select>

<input class="button" value="Enregistrer «&nbsp;Print 
Operators&nbsp;»" type="submit">

<br>

-------------------------------------------

Strange size? Is it a dropdown, maybe, but the user list fails?

in menu tree :

Horde

   |-organizing

   |-setup

         |-group

                |-all group

                        |- Horde

when i select a group , four sections appear :

GroupName: function is ok

member list: function is ok

Add member: funstion is not ok ,field "add membre" have a strange size 
and I can't set the focus on

groups:function is ok

What do you mean by "the field is not accessible"? What error messages 
do you get?

When used auth_ldap as authentification method and  group with ldap 
backends , i can't add new user to groups. the field is not accessible.

other authenfication method (smbclient , posix ...) is ok.