Switchboard segfaults in Quantal

[Łukasz Halman]

Switchboard doesn't start in Ubuntu Quantal Beta 1 AMD64 [updated with all fresh packages]. When launched from terminal, following appears:
[_LOG_LEVEL_INFO 19:10:04.410982] switchboard-app.vala:506: Welcome to System Settings
[_LOG_LEVEL_INFO 19:10:04.411114] switchboard-app.vala:507: Version: 0.9
[_LOG_LEVEL_INFO 19:10:04.411184] switchboard-app.vala:508: Report any issues/bugs you mind find to lp:switchboard
[_LOG_LEVEL_WARN 19:10:04.453994] [Gtk] Theme parsing error: gtk-widgets.css:216:20: Not using units is deprecated. Assuming 'px'.
[_LOG_LEVEL_WARN 19:10:04.454186] [Gtk] Theme parsing error: gtk-widgets.css:217:20: Not using units is deprecated. Assuming 'px'.
[_LOG_LEVEL_WARN 19:10:04.454483] [Gtk] Theme parsing error: gtk-widgets.css:251:20: Not using units is deprecated. Assuming 'px'.
[_LOG_LEVEL_WARN 19:10:04.454657] [Gtk] Theme parsing error: gtk-widgets.css:252:20: Not using units is deprecated. Assuming 'px'.
[_LOG_LEVEL_WARN 19:10:04.496206] [Gtk] Theme parsing error: button.css:151:20: Not using units is deprecated. Assuming 'px'.
[_LOG_LEVEL_WARN 19:10:04.496336] [Gtk] Theme parsing error: button.css:152:20: Not using units is deprecated. Assuming 'px'.
[_LOG_LEVEL_WARN 19:10:04.501645] [Gtk] Theme parsing error: content-view.css:92:20: Not using units is deprecated. Assuming 'px'.
[_LOG_LEVEL_INFO 19:10:04.513520] Application.vala:71: Switchboard version: 0.9
[_LOG_LEVEL_INFO 19:10:04.513619] Application.vala:73: Kernel version: 3.5.0-15-generic
[_LOG_LEVEL_FATAL 19:10:04.533687] [GLib-GIO] g_application_list_actions: assertion `application->priv->is_registered' failed
[_LOG_LEVEL_FATAL 19:10:04.533741] Switchboard will not function properly.
Naruszenie ochrony pamięci (core dumped)

Stacktrace from gdb:
#0 0x00007ffff74ec3e8 in ?? () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#1 0x00007ffff7765154 in gtk_window_set_application ()
   from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#2 0x0000000000406da5 in switchboard_switchboard_app_construct ()
#3 0x0000000000407b22 in switchboard_switchboard_app_new ()
#4 0x000000000040e955 in switchboard_main ()
#5 0x000000000040eaa3 in main ()