screen is dark when i start the computer and the icons vanish some times

[Felipe dos Anjos Neveshen]

Every problems began when I downloaded the most new version of ubunto 11.4..

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: eog 2.32.1-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
NonfreeKernelModules: wl
Architecture: i386
Date: Sat May 28 17:44:35 2011
ExecutablePath: /usr/bin/eog
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
ProcEnviron:
 LANGUAGE=pt_BR:en
 PATH=(custom, user)
 LANG=pt_BR.UTF-8
 SHELL=/bin/bash
SourcePackage: eog
UpgradeStatus: No upgrade log present (probably fresh install)