Steps to reproduce:
1. Right click on the song, choose "Modify Track Information".
2. Choose any field, start typing.
3. Crash.


Stack trace:
bash-3.2$ banshee-1 
[Info  15:20:21.243] Running Banshee 1.4.1
[Info  15:20:25.763] All services are started 3,982364s
[Info  15:20:27.921] nereid Client Started
System.ApplicationException: Could not find org.freedesktop.Avahi
  at Mono.Zeroconf.Providers.AvahiDBus.DBusManager.Initialize () [0x00000] 
  at Mono.Zeroconf.Providers.AvahiDBus.ZeroconfProvider.Initialize () [0x00000] 
  at Mono.Zeroconf.Providers.ProviderFactory.GetProviders () [0x00000] 
System.DllNotFoundException: libnss_mdns-0.2.so
  at (wrapper managed-to-native) Mono.Zeroconf.Providers.Bonjour.Native:DNSServiceCreateConnection (Mono.Zeroconf.Providers.Bonjour.ServiceRef&)
  at Mono.Zeroconf.Providers.Bonjour.Zeroconf.Initialize () [0x00000] 
  at Mono.Zeroconf.Providers.Bonjour.ZeroconfProvider.Initialize () [0x00000] 
  at Mono.Zeroconf.Providers.ProviderFactory.GetProviders () [0x00000] 
[Warn  15:20:29.104] Failed to start DAAP client - No Zeroconf providers could be found or initialized. Necessary daemon may not be running. (in `Mono.Zeroconf')
  at Mono.Zeroconf.Providers.ProviderFactory.GetProviders () [0x00000] 
  at Mono.Zeroconf.Providers.ProviderFactory.get_DefaultProvider () [0x00000] 
  at Mono.Zeroconf.Providers.ProviderFactory.get_SelectedProvider () [0x00000] 
  at Mono.Zeroconf.ServiceBrowser..ctor () [0x00000] 
  at Daap.ServiceLocator.Start () [0x00000] 
  at Banshee.Daap.DaapService.DelayedInitialize () [0x00000] 
Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.InvalidCastException: Cannot cast from source type to destination type.
  at Gtk.TextInsertedArgs.get_Position () [0x00000] 
  at Hyena.Gui.EditableUndoAdapter`1[Gtk.Entry].OnTextInserted (System.Object o, Gtk.TextInsertedArgs args) [0x00000] 
  at Gtk.Entry.TextInsertedSignalCallback (IntPtr arg0, IntPtr arg1, Int32 arg2, System.Int32& arg3, IntPtr gch) [0x00000] 
   at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
   at Gtk.Entry.TextInsertedSignalCallback(IntPtr arg0, IntPtr arg1, Int32 arg2, Int32 ByRef arg3, IntPtr gch)
   at Gtk.Dialog.gtk_dialog_run(IntPtr )
   at Gtk.Dialog.Run()
   at Banshee.Gui.TrackEditor.TrackEditorDialog.Run(Banshee.Collection.TrackListModel model, EditorMode mode)
   at Banshee.Gui.TrackEditor.TrackEditorDialog.RunEdit(Banshee.Collection.TrackListModel model)
   at Banshee.Gui.TrackActions.OnTrackEditor(System.Object o, System.EventArgs args)
   at System.Reflection.MonoMethod.InternalInvoke(System.Object , System.Object[] , System.Exception ByRef )
   at System.Reflection.MonoMethod.Invoke(System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)
   at System.Reflection.MethodBase.Invoke(System.Object obj, System.Object[] parameters)
   at System.Delegate.DynamicInvokeImpl(System.Object[] args)
   at System.MulticastDelegate.DynamicInvokeImpl(System.Object[] args)
   at System.Delegate.DynamicInvoke(System.Object[] args)
   at GLib.Signal.ClosureInvokedCB(System.Object o, GLib.ClosureInvokedArgs args)
   at GLib.SignalClosure.Invoke(GLib.ClosureInvokedArgs args)
   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 Banshee.Gui.GtkBaseClient.Run()
   at Banshee.Gui.GtkBaseClient.Startup()
   at Hyena.Gui.CleanRoomStartup.Startup(Hyena.Gui.StartupInvocationHandler startup)
   at Banshee.Gui.GtkBaseClient.Startup()
   at Banshee.Gui.GtkBaseClient.Startup(System.String[] args)
   at Nereid.Client.Main(System.String[] args)
   at System.AppDomain.ExecuteAssembly(System.Reflection.Assembly , System.String[] )
   at System.AppDomain.ExecuteAssemblyInternal(System.Reflection.Assembly a, System.String[] args)
   at System.AppDomain.ExecuteAssembly(System.String assemblyFile, System.Security.Policy.Evidence assemblySecurity, System.String[] args)
   at System.AppDomain.ExecuteAssembly(System.String assemblyFile)
   at Booter.Booter.BootClient(System.String clientName)
   at Booter.Booter.Main()

Other information: