resizing multiple images with gthumb fails, it just does it with one ore two of selected files

Binary package hint: gthumb

i've tried out with other programs but they do not make the files with the same weight as gthumb did before

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: nautilus 1:2.32.0-0ubuntu1.3
ProcVersionSignature: Ubuntu 2.6.35-27.48-generic 2.6.35.11
Uname: Linux 2.6.35-27-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Fri Mar 11 11:40:21 2011
ExecutablePath: /usr/bin/nautilus
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcEnviron:
 LANG=es_AR.UTF-8
 SHELL=/bin/bash
SourcePackage: nautilus