Description of problem:
gnome-do cannot open preferences window

Version-Release number of selected component (if applicable):
$ yum info gnome-do
Installed Packages
Name        : gnome-do
Arch        : x86_64
Version     : 0.8.3.1
Release     : 5.fc15
Size        : 1.6 M
Repo        : installed
From repo   : fedora
( ... )

How reproducible:
Always

Steps to Reproduce:
1. open gnome-do (the search window displays, and is useable)
2. click the corner menu arrow and select "preferences"
  
Actual results:
The following is printed to the console I started gnome-do from, and gnome-do dies:

[Error 23:17:28.075] Could not load desktop item: libgnome-desktop-2.so.17
[Error 23:17:28.102] Could not load desktop item: libgnome-desktop-2.so.17
[Error 23:17:28.102] Could not load desktop item: libgnome-desktop-2.so.17
[Error 23:17:28.102] Could not load desktop item: libgnome-desktop-2.so.17
[Error 23:17:28.102] Could not load desktop item: libgnome-desktop-2.so.17
  < repeated hundreds of times with slightly different timestamps >
[Error 23:17:28.102] Could not load desktop item: libgnome-desktop-2.so.17
Marshaling activate signal
Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.DllNotFoundException: libgnome-desktop-2.so.17
  at (wrapper managed-to-native) Gnome.DesktopItem:gnome_desktop_item_new_from_uri (intptr,int,intptr&)
  at Gnome.DesktopItem.NewFromUri (System.String uri, DesktopItemLoadFlags flags) [0x00000] in <filename unknown>:0 
  at Do.Platform.Linux.SystemService.get_AutoStartFile () [0x00000] in <filename unknown>:0 
  at Do.Platform.Linux.SystemService.IsAutoStartEnabled () [0x00000] in <filename unknown>:0 
  at Do.UI.GeneralPreferencesWidget.get_AutostartEnabled () [0x00000] in <filename unknown>:0 
  at Do.UI.GeneralPreferencesWidget..ctor () [0x00000] in <filename unknown>:0 
  at Do.UI.PreferencesWindow..ctor () [0x00000] in <filename unknown>:0 
  at Do.Core.Controller.ShowPreferences () [0x00000] in <filename unknown>:0 
  at Do.Universe.PreferencesItem.Run () [0x00000] in <filename unknown>:0 
  at Do.UI.MainMenu+<MenuItemFromRunnableItem>c__AnonStorey12.<>m__2B (System.Object sender, System.EventArgs e) [0x00000] in <filename unknown>:0 
  at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0 
  --- End of inner exception stack trace ---
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0 
  at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in <filename unknown>:0 
  at System.Delegate.DynamicInvokeImpl (System.Object[] args) [0x00000] in <filename unknown>:0 
  at System.MulticastDelegate.DynamicInvokeImpl (System.Object[] args) [0x00000] in <filename unknown>:0 
  at System.Delegate.DynamicInvoke (System.Object[] args) [0x00000] in <filename unknown>:0 
  at GLib.Signal.ClosureInvokedCB (System.Object o, GLib.ClosureInvokedArgs args) [0x00000] in <filename unknown>:0 
  at GLib.SignalClosure.Invoke (GLib.ClosureInvokedArgs args) [0x00000] in <filename unknown>:0 
  at GLib.SignalClosure.MarshalCallback (IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data) [0x00000] in <filename unknown>:0 
   at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
   at GLib.SignalClosure.MarshalCallback(IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data)
   at Gtk.Application.gtk_main()
   at Gtk.Application.Run()
   at Do.Do.Main(System.String[] args)



Expected results:
The preferences window

Additional info: