Steps to reproduce:
1. In Banshee, select "New smart playlist"
2. Change album in the match rule to Play Count
3. Banshee dies


Stack trace:
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.QueryMatchInteger.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__AnonymousMethod148 ()
   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 ()
Realtidssignal 1
pontus@pontus:~/Utveckling/banshee/svn/src$ 


Other information:
Problem exists in Ubuntu Gutsy Banshee (labeled 0.12.1+dfsg-5 as well). Haven't tried all options but seems to NOT occur only for Album, Artist and Title.

It seems I can use predefined playlists that contain these matches but not open them in the editor.