Bug 16501

Запускаем tomboy, щёлкаем на иконке в таскбаре, выбираем Notebooks -> New Notebook...
Задаём имя foobar и получаем полный отпад:

[DEBUG]: Creating Buffer for 'foobar Notebook Template'...
[DEBUG]: Tag added to foobar Notebook Template: system:template
[DEBUG]: Tag added to foobar Notebook Template: system:notebook:foobar
[DEBUG]: Created the notebook: foobar (foobar)
Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.NullReferenceException: Object reference not set to an instance of an object
  at Tomboy.Notebooks.NotebookManager.PromptCreateNewNotebook (Gtk.Window parent, System.Collections.Generic.List`1 notesToAdd) [0x00000] 
  at Tomboy.Notebooks.NotebookManager.PromptCreateNewNotebook (Gtk.Window parent) [0x00000] 
  at Tomboy.Notebooks.NotebookApplicationAddin.OnNewNotebookMenuItem (System.Object sender, System.EventArgs args) [0x00000] 
  at GLib.Signal.voidObjectCallback (IntPtr handle, IntPtr data) [0x00000] 
   at GLib.ExceptionManager.RaiseUnhandledException(System.Exception e, Boolean is_terminal)
   at GLib.Signal.voidObjectCallback(IntPtr handle, IntPtr data)
   at GLib.Signal.voidObjectCallback(IntPtr , IntPtr )
   at Gtk.Application.gtk_main()
   at Gtk.Application.gtk_main()
   at Gtk.Application.Run()
   at Gnome.Program.Run()
   at Tomboy.Application.StartMainLoop()
   at Tomboy.Tomboy.StartTrayIcon()
   at Tomboy.Tomboy.Main(System.String[] args)
/usr/bin/tomboy: line 14:  4403 Segmentation fault      mono $MONO_EXTRA_ARGS $THIS_EXE "$@"