Steps to reproduce:
1. From the main menu select 'Music'
2. -> 'New smart playlist'
3. -> Enter a Playlist name.
4. -> Change 'Album' in the drop down list to 'Rating'
5. Crash


Stack trace:
gmurphy@nourae:~$ banshee
Debug: [10/03/2008 2:29:37 PM] (Loading audio profiles) - /usr/share/banshee/audio-profiles
Debug: [10/03/2008 2:29:38 PM] (Default player engine) - GStreamer 0.10
Debug: [10/03/2008 2:29:38 PM] (Audio CD Core Initialized) - 
Performing compatibility update on playlist 'New Playlist 1'
Debug: [10/03/2008 2:29:40 PM] (Testing device for DAP support) - /org/freedesktop/Hal/devices/volume_uuid_62f7ec6f_ab4d_4f38_9ac5_acc81bae9b22
Debug: [10/03/2008 2:29:40 PM] (DAP has not been added) - /org/freedesktop/Hal/devices/volume_uuid_62f7ec6f_ab4d_4f38_9ac5_acc81bae9b22
Warning: [10/03/2008 2:29:40 PM] (Power Management Call Failed) - Cannot find GNOME Power Manager: Name org.gnome.PowerManager has no owner
Debug: [10/03/2008 2:29:40 PM] (Enabled multimedia keys support) - Using org.gnome.SettingsDaemon
Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.IndexOutOfRangeException: Array index is out of range.
  at Banshee.SmartPlaylist.QueryMatch.get_Filter () [0x00000] 
  at Banshee.SmartPlaylist.QueryMatchRating.get_DisplayWidget () [0x00000] 
  at Banshee.SmartPlaylist.QueryBuilderMatchRow.OnOpComboBoxChanged (System.Object o, System.EventArgs args) [0x00000] 
  at (wrapper delegate-invoke) System.MulticastDelegate:invoke_void_object_EventArgs (object,System.EventArgs)
  at GLib.Signal.voidObjectCallback (IntPtr handle, IntPtr gch) [0x00000] 

   at GLib.ExceptionManager.RaiseUnhandledException ()
   at GLib.Signal.voidObjectCallback ()
   at GLib.Signal.voidObjectCallback ()
   at Gtk.ComboBox.gtk_combo_box_remove_text ()
   at Gtk.ComboBox.gtk_combo_box_remove_text ()
   at Gtk.ComboBox.RemoveText ()
   at Banshee.SmartPlaylist.QueryBuilderMatchRow.Select ()
   at Banshee.SmartPlaylist.QueryBuilderMatchRow.OnFieldComboBoxChanged ()
   at System.MulticastDelegate.invoke_void_object_EventArgs ()
   at GLib.Signal.voidObjectCallback ()
   at GLib.Signal.voidObjectCallback ()
   at Gtk.Dialog.gtk_dialog_run ()
   at Gtk.Dialog.gtk_dialog_run ()
   at Gtk.Dialog.Run ()
   at Banshee.SmartPlaylist.Editor.Run ()
   at Banshee.SmartPlaylist.Editor.RunDialog ()
   at Banshee.SmartPlaylist.SmartPlaylistCore+<>c__CompilerGenerated46.<>c__AnonymousMethod151 ()
   at System.MulticastDelegate.invoke_void_object_EventArgs ()
   at GLib.Signal.voidObjectCallback ()
   at GLib.Signal.voidObjectCallback ()
   at Gtk.Application.gtk_main ()
   at Gtk.Application.gtk_main ()
   at Gtk.Application.Run ()
   at Gnome.Program.Run ()
   at Banshee.BansheeEntry.Startup ()
   at System.MulticastDelegate.invoke_void_string[] ()
   at Banshee.Gui.CleanRoomStartup.Startup ()
   at Banshee.BansheeEntry.Main ()
gmurphy@nourae:~$ 


Other information: