When using workgroup manager i can't select group or users

Using Lion Server 10.7.4

When using workgroup manager I can't select a group or a users, as soon as I select one it disapear from the list, I do another search and the group is there but i can't select it, tried to select with keys still not working it disapear. I'm authentified on the AD server with the rights to change account but I can't do nothing since i can't select. I'm trying to set a home folder through AFP on my mac server so the user can have their pref saved on a server instead of locally.