This seems to be an issue with the humanity-icon-theme. I can confirm that the icons do not show up under humanity. Yet, they do show up under a variety of other themes I tested, including: Human, GNOME-Colors, Tango, and GNOME.
This seems to be an issue with the humanity- icon-theme. I can confirm that the icons do not show up under humanity. Yet, they do show up under a variety of other themes I tested, including: Human, GNOME-Colors, Tango, and GNOME.