I installed/activated the plugin, added it to my sidebar, entered a title (I was expecting more configuration than that), and....nothing. I don't even see the title. I'm using WP 3.3.2 and a modified version of my own starter theme (for building custom themes).
I tried switching to Twenty Eleven within the same install, but wasn't able to get it to show.
To further test, I tried it on a clean install with a fresh version of my starter theme and it showed up, which I don't understand. I haven't had difficulty with any other widget.
Any idea what might be the culprit?