Mike, i'm also having an issue with this too. It seems there is a problem with the template, if I enable the default Kunena Blue Eagle 2.0 the menu appears to function as normal. Even if I click on the blank icons it isn't inserting the code either.
http://www.firingsquad.us/index.php/forum/indexEdit: I'll help ya along at least with the images...
kunena.default-min.css
#Kunena #kbbcode-toolbar li a, #Kunena #kattachments a {
background-image: url("../media/iconsets/editor/default/default.
gif");
Needs to be changed to .png
Code is still not working though.