I found my way around the array bug and installed (manually, not as a widget) your great plug-in on my site <http://www.gnosiscafe.com/gcblog/>. I wanted the triangles for expanding and collapsing the years and months, but got two diamond-with-question-mark characters instead. So I switched to the + and - option, but as you can see, any category that is expanded now has three diamond characters instead.