Ubuntu software-center crashes on xubuntu Oneiric with no apparent reason just stays grey

[GridCube]

this is all of the warnings i get:

2011-11-13 21:16:28,987 - softwarecenter.ui.gtk3.em - INFO - EM's: 15 12 17
2011-11-13 21:16:33,021 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file
2011-11-13 21:16:33,802 - softwarecenter.ui.gtk3.utils - INFO - Softwarecenter style provider for greybird Gtk theme: /usr/share/software-center/ui/gtk3/css/softwarecenter.css

also appending a screenshot

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: software-center 5.0.2
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Sun Nov 13 21:15:18 2011
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=es_AR:es
 PATH=(custom, no user)
 LANG=es_AR.UTF-8
 SHELL=/bin/bash
SourcePackage: software-center
UpgradeStatus: No upgrade log present (probably fresh install)

[Gary Lasker (gary-lasker)]

Hi GridCube! Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 772549, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.

Thanks again!