Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/ui/gtk/app.py", line 550, in on_view_switcher_changed
    self.view_manager.set_active_view(view_id)
  File "/usr/share/software-center/softwarecenter/ui/gtk/viewmanager.py", line 39, in set_active_view
    active_view_widget.init_view()
  File "/usr/share/software-center/softwarecenter/ui/gtk/availablepane.py", line 127, in init_view
    SoftwarePane.init_view(self)
  File "/usr/share/software-center/softwarecenter/ui/gtk/softwarepane.py", line 252, in init_view
    self)
  File "/usr/share/software-center/softwarecenter/ui/gtk/appdetailsview_gtk.py", line 757, in __init__
    self._layout_page()
  File "/usr/share/software-center/softwarecenter/ui/gtk/appdetailsview_gtk.py", line 1096, in _layout_page
    self.screenshot = ScreenshotThumbnail(get_distro(), self.icons)
  File "/usr/share/software-center/softwarecenter/ui/gtk/widgets/thumbnail.py", line 48, in __init__
    zoom_pb = theme.load_icon(gtk.STOCK_ZOOM_IN, 22, 0)
GError: Symbol »gtk-zoom-in« nicht im Thema vorhanden