Works most of the time

When this widget works, it works well and is easy to use. It has worked on 4 out of 5 of my sites. On the 5th site, however, using the same theme and version of theme as the other 4 sites, it will not work at all. I can load it into the sidebar, load an image and text into it, save it, and absolutely nothing happens. I’d like to give this plugin a 5-star rating, and I’d like to be a raving fan. When it’s fixed, I will.