title: GLib-GObject-CRITICAL **: g_signal_handler_disconnect: assertion `handler_id > 0' failed
body: <p>What generally causes this?</p>
  
  <p>What strategies can I use to track the problem down?</p>
  
  <p>I have 6 buttons in a glade (gtk3.0) file - I see 6 warnings..., initially I wasn't getting these errors unitl after editing the glade file and making some (unrelated?) changes to my source - (I implemented an extra signal handler which amongst other things changes the buttons image to one of two (toggles) specified in the glade file)</p>