Comment 58 for bug 596727

I have the same problem, it crashes only when accesing system.

GConf.NoSuchKeyException: Key '/apps/sysinfo/window_width' not found in GConf
  at GConf.Client.Get (System.String key) <0x40e634b0 + 0x00117> in <filename unknown>:0
  at Sysinfo.Sysinfo..ctor (System.String[] args) <0x412cf720 + 0x01394> in <filename unknown>:0
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 Sysinfo.SystemInfo.Gnome () <0x40e77900 + 0x000a0> in <filename unknown>:0
  at Sysinfo.Sysinfo.on_notebook1_switch_page (System.Object o, Gtk.SwitchPageArgs e) <0x40e79000 + 0x0011b> in <filename unknown>:0
  at Gtk.Notebook.SwitchPageSignalCallback (IntPtr arg0, IntPtr arg1, UInt32 arg2, IntPtr gch) <0x40e76f00 + 0x002cf> in <filename unknown>:0
  at GLib.ExceptionManager.RaiseUnhandledException (System.Exception e, Boolean is_terminal) [0x00000] in <filename unknown>:0
  at Gtk.Notebook.SwitchPageSignalCallback (IntPtr arg0, IntPtr arg1, UInt32 arg2, IntPtr gch) [0x00000] in <filename unknown>:0
  at Gtk.Notebook.gtk_notebook_set_current_page (IntPtr , Int32 ) [0x00000] in <filename unknown>:0
  at Gtk.Notebook.set_CurrentPage (Int32 value) [0x00000] in <filename unknown>:0
  at Sysinfo.Sysinfo..ctor (System.String[] args) [0x00000] in <filename unknown>:0
  at Sysinfo.Sysinfo.Main (System.String[] args) [0x00000] in <filename unknown>:0