Comment 1 for bug 1093579

I have the same problem, also on 12.04.1. Had an older version (don`t remember which one exactly, but it was installed from Software Center) and it worked just fine. This is the output from verbose:

DEBUG:slidewall: set_up_logging() 'logging enabled'
/usr/lib/python2.7/dist-packages/gi/overrides/Gtk.py:391: Warning: g_object_set_property: construct property "type" for object `Window' can't be set after construction
  Gtk.Window.__init__(self, type=type, **kwds)

(slidewall:22010): Gtk-CRITICAL **: gtk_radio_button_set_group: assertion `!g_slist_find (group, radio_button)' failed
WARNING:slidewall_lib: connect_signals() 'expected handler 'bt' in /usr/lib/python2.7/dist-packages/slidewall/SlidewallWindow.pyc'

 Loading...

{'new wallbase': '/usr/share/slidewall/media/new.png', 'live earth': '/usr/share/slidewall/media/map.png', 'random wallbase': '/usr/share/slidewall/media/random.png'}

  with keys:['new wallbase', 'live earth', 'random wallbase']
Loading::/usr/share/slidewall/media/new.png
Loading::/usr/share/slidewall/media/map.png
Loading::/usr/share/slidewall/media/random.png
liveengine::lists of clocks['radarblue', 'slidewall.jpg', 'goldflame', 'soundwave', 'lcd_blue']
Loading::/home/mihnea/.local/share/slidewall/live/radarblue
Loading::/home/mihnea/.local/share/slidewall/live/goldflame
Loading::/home/mihnea/.local/share/slidewall/live/soundwave
Loading::/home/mihnea/.local/share/slidewall/live/lcd_blue

(slidewall:22010): Gtk-WARNING **: /build/buildd/gtk+3.0-3.4.2/./gtk/gtkwidget.c:3749: child-property-changed notification for GtkIconView(0x2b32440) is not frozen
Traceback (most recent call last):
  File "/usr/bin/slidewall", line 44, in <module>
    slidewall.main()
  File "/usr/lib/python2.7/dist-packages/slidewall/__init__.py", line 44, in main
    window = SlidewallWindow.SlidewallWindow()
  File "/usr/lib/python2.7/dist-packages/slidewall_lib/Window.py", line 56, in __new__
    new_object.finish_initializing(builder)
  File "/usr/lib/python2.7/dist-packages/slidewall/SlidewallWindow.py", line 34, in finish_initializing
    super(SlidewallWindow, self).finish_initializing(builder)
  File "/usr/lib/python2.7/dist-packages/slidewall_lib/Window.py", line 131, in finish_initializing
    self.load_config_file()
  File "/usr/lib/python2.7/dist-packages/slidewall_lib/Window.py", line 317, in load_config_file
    self.ui.check_autostart.set_active(data['check_autostart'])
  File "/usr/lib/python2.7/shelve.py", line 121, in __getitem__
    f = StringIO(self.dict[key])
  File "/usr/lib/python2.7/bsddb/__init__.py", line 270, in __getitem__
    return _DeadlockWrap(lambda: self.db[key]) # self.db[key]
  File "/usr/lib/python2.7/bsddb/dbutils.py", line 68, in DeadlockWrap
    return function(*_args, **_kwargs)
  File "/usr/lib/python2.7/bsddb/__init__.py", line 270, in <lambda>
    return _DeadlockWrap(lambda: self.db[key]) # self.db[key]
KeyError: 'check_autostart'