Thunar-shares-plugin works fine un Xubuntu/Lubuntu/*buntu but not in Debian, i'm using Xubuntu 10.04, Lubuntu 10.04, Sidux, and Debian Testing (LXDE)

I tested thunar-shares-plugin in Xubuntu and it worked fine, worked fine in Lubuntu too, but it doesn't in Debian, and I don't know why.

I downloaded the pluging here:
http://packages.linuxmint.com/list.php?release=Isadora-Xfce

A .deb file, and I used this manual:

http://goodies.xfce.org/projects/thunar-plugins/thunar-shares-plugin#setup-samba

I installed samba and libpam-smbpass, created a group:

  export USERSHARES_DIR="/var/lib/samba/usershares"
  export USERSHARES_GROUP="sambashare"
  mkdir -p ${USERSHARES_DIR}
  groupadd ${USERSHARES_GROUP}
  chown root:${USERSHARES_GROUP} ${USERSHARES_DIR}
  chmod 01770 ${USERSHARES_DIR}

smb.conf edited:

  [global]
  workgroup = WORKGROUP
  security = share
  usershare path = /var/lib/samba/usershares
  usershare max shares = 100
  usershare allow guests = yes
  usershare owner only = yes

usermod -a -G ${USERSHARES_GROUP} My_Username

Samba restarted

/etc/init.d/samba restart

And finally I restarted the computer...

Now I can see the "Share page" in the properties, and I can "share the folder", but when i try to access into the folder using my network, it doesn't work, i got and error message (in spanish)

Falló al montar la compartición Windows
(Failed mounting the Windows sharing)

La ubicación especificada no está montada
(Specified location is not mounted)

I don't know what is happening, it works nice in *buntu, but not in Debian/Sidux