Black strip in the middle of the screen ( horizontal)

Binary package hint: gnome-panel

In Ubuntu 7.10 Gutsy Gibbon, worked fine until a new update, then an awfull black band appears when the screen to put the name and password is in. I can put by memory without seen where, name and passwd, but when entering the 1/3 of the screen black strip, appears again.
I did a couple of updates, but the problem is still here, fucking the easy operation of the programs.
I worked around Bug #134284 in xorg, but nothing happends.

ProblemType: Bug
Architecture: i386
Date: Wed Sep 12 08:42:14 2007
DistroRelease: Ubuntu 7.10
ExecutablePath: /usr/bin/gnome-panel
Package: gnome-panel 1:2.19.92-0ubuntu1
PackageArchitecture: i386
ProcCmdline: gnome-panel --sm-client-id default1
ProcCwd: /home/bill
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=es_AR.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-panel
Uname: Linux bill-ubuntu-gutsy 2.6.22-11-generic #1 SMP Fri Sep 7 05:07:05 GMT 2007 i686 GNU/Linux