[Centos] Problem with change user

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Hi!

I'm test CentOS in this moment, before used White Box and  I had the same 
problem when I change from normal user to postgres:

[puc at carcel ]$ su - postgres
Password:
free(): invalid pointer 0x7ed1d0!
free(): invalid pointer 0x9af7930!
Segmentation fault
[puc at carcel ]$

I'm using LDAP, but user "puc" is a local user, if I don't to autentificar 
whit LDAP the change work.

I have tried to do:

[puc at carcel ]$ strace su - postgres

and between the information what give me it's this:

open("/usr/share/locale/en_US.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 
ENOENT (No such file or directory)
open("/usr/share/locale/en_US.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 
ENOENT (No such file or directory)
open("/usr/share/locale/en_US/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT 
(No such file or directory)
open("/usr/share/locale/en.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 
ENOENT (No such file or directory)
open("/usr/share/locale/en.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 
ENOENT (No such file or directory)
open("/usr/share/locale/en/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT 
(No such file or directory)

Somebody help me please.
- -- 
Cristofer Reyes Aguilera linux-user #353991                           
http://www.inf.utfsm.cl/~crreyes
Laboratorio de Computacion, Departamento de Informatica, UTFSM
crreyes (at) inf (dot) utfsm (dot) cl
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