[Zope] Lost user credentials

Hi all! Some days ago I send to the list a question about a problem losting user credentials In my code I don't use nothing about security and nothing is changed on zmi's security tab But when I launch a method (Borrar if you remember) the user who launches the action is anonymous not the logged one Can you point me what is happening? Thanks! -- Mis Cosas: http://blogs.sistes.net/Garito