This bug was fixed in the package software-center - 3.1.25

---------------
software-center (3.1.25) natty; urgency=low

  [ Kiwinote ]
  * data/ui/SoftwareCenter.ui:
    - mark the back/forward actions as translatable (LP: #742129)
  * softwarecenter/db/database.py,
    softwarecenter/models/appstore.py,
    softwarecenter/view/availablepane.py,
    others:
    - make custom lists work (LP: #712903)
  * softwarecenter/app.py,
    softwarecenter/distro/Ubuntu.py,
    softwarecenter/view/widgets/pathbar_gtk_atk.py:
    - when the supported filter is set to supported_only, navigate up if:
      - we are in a details view of an app which is not supported (LP: #480827)
      - we are in a list view which becomes empty
  * softwarecenter/app.py,
    softwarecenter/view/catview_gtk.py:
    - correctly count the nr of apps displayed in the recommended category and
      update it when needed (LP: #735634)
    - only display subcategories if they are non-empty (LP: #419270)
  * softwarecenter/backend/weblive.py:
    - don't crash if we try to delete a non-existent file (LP: #743511)
  * softwarecenter/db/reviews.py,
    softwarecenter/distro/Ubuntu.py:
    - fallback to ReviewLoaderJsonAsync when we can't use multiprocessing
      (LP: #741069)
    - fixes to make ReviewLoaderJsonAsync 'work' (ie most common cases)
  * softwarecenter/db/update.py:
    - don't import softwarecenter.log
  * softwarecenter/view/appdetailsview_gtk.py:
    - don't draw random boxes when we have an error layout (LP: #739269)
    - retire share button as we now have full microblogging support in the
      review dialog (LP: #592619, LP: #743765)
  * softwarecenter/view/appview.py:
    - correctly refresh listview when supported filters are changed
  * softwarecenter/view/catview.py:
    - if a category has subcategories, then category.query should include all
      items included in the subcategories, not a subset of these
  * softwarecenter/view/widgets/pathbar_gtk_atk.py:
    - avoid having a half-height pathbar (LP: #743614)
  * refresh .pot file

  [ Gary Lasker ]
  * softwarecenter/view/widgets/reviews.py:
    - fix crash if app_version is not defined when
      calling upstream_version_compare (LP: #746120)
  * softwarecenter/view/purchaseview.py:
    - disconnect webkit signal handlers when the webkit view
      is not showing (LP: #696861)
    - support 'user_cancelled' from the software-center-agent
      (LP: #641321)
  * softwarecenter/view/softwarepane.py,
    softwarecenter/view/widgets/actionbar.py:
    - animate the action bar show/hide
  * softwarecenter/view/appview.py:
    - in the AppViewFilter, also consider apps in the for-purchase
      channel as available; this allows them to show up in
      e.g. What's New (LP: #746679)

  [ Michael Vogt ]
  * softwarecenter/db/update.py:
    - ensure the iconname that comes from the software-center-agent
      does not contain a ".", the icon cache gets confused otherwise
  * merged lp:~evfool/software-center/sfix672229, many thanks to
    Robert Roth (LP: #672229)
  * merged lp:~alexeftimie/software-center/fix-704719-briefly-wrong-display,
    many thanks to Alex Eftimie (LP: #704719)
  * softwarecenter/view/purchaseview.py:
    - add visual feedback when data is loading
  * po/POTFILES.in, po/software-center.pot:
    - remove [type: python] and run setup.py build_i18n, looks like
      intltool is confused about this type and left those files out
      (LP: #746397)
  * softwarecenter/backend/aptd.py:
    - use more robust approach for handling the commercial PPA ready
      polling (LP: #708372)
  * softwarecenter/view/appdetailsview.py, softwarecenter/distro/Ubuntu.py:
    - fix purchase url on natty, thanks to davmor2
 -- Michael Vogt <email address hidden>   Fri, 01 Apr 2011 08:06:13 +0200