this report has been filed here:

https://bugs.edge.launchpad.net/ubuntu/+source/f-spot/+bug/368267

"F-Spot crashes with the following console output when I try to open the Preferences. If I remove the photos.db file in .gnome2/f-spot, the crash does not happen. But of course, in that case I lose all my pictures metadata. The photos.db file was last (successfully) opened by F-Spot in previous version.

[Info 18:14:07.119] Initializing DBus
[Info 18:14:07.202] Initializing Mono.Addins
[Info 18:14:07.335] Starting new FSpot server
[Info 18:14:08.337] Starting BeagleService
[Info 18:14:08.337] Hack for gnome-settings-daemon engaged

(f-spot:27615): GdkPixbuf-WARNING **: GdkPixbufLoader finalized without calling gdk_pixbuf_loader_close() - this is not allowed. You must explicitly end the data stream to the loader before dropping the last reference.
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.NullReferenceException: Object reference not set to an instance of an object
  at FSpot.UI.Dialog.PreferenceDialog.LoadPreference (System.String key) [0x00000]
  at FSpot.UI.Dialog.PreferenceDialog..ctor () [0x00000]
  at FSpot.UI.Dialog.PreferenceDialog.Show () [0x00000]
  at MainWindow.HandlePreferences (System.Object sender, System.EventArgs args) [0x00000]
  at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (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]
  --- 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]
  at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000]
  at System.Delegate.DynamicInvokeImpl (System.Object[] args) [0x00000]
  at System.MulticastDelegate.DynamicInvokeImpl (System.Object[] args) [0x00000]
  at System.Delegate.DynamicInvoke (System.Object[] args) [0x00000]
  at GLib.Signal.ClosureInvokedCB (System.Object o, GLib.ClosureInvokedArgs args) [0x00000]
  at GLib.SignalClosure.Invoke (GLib.ClosureInvokedArgs args) [0x00000]
  at GLib.SignalClosure.MarshalCallback (IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data) [0x00000]
   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 Gnome.Program.Run()
   at FSpot.Driver.Main(System.String[] args)"

database: 

http://launchpadlibrarian.net/26085446/photos.db

Thanks,