Comment 2 for bug 603251

It turns out the applet was relying on behavior that changed in GTK+ 2.20:

"Prior to 2.20, GtkBuilder was setting the "name" property of constructed widgets to the "id" attribute. In GTK+ 2.20 or newer, you have to use gtk_buildable_get_name() instead of gtk_widget_get_name() to obtain the "id", or set the "name" property in your UI definition." [http://library.gnome.org/devel/gtk/stable/GtkBuilder.html]

The applet had been using the clicked menu item's "name" property to figure out which one was clicked, but that doesn't work anymore.