This issue was first reported by DaxterSpeed, and again by Rob, and I’ve been trying to figure it out for a while. Everything works fine in the theme, there are no JS errors, but the accordion doesn’t work. It turns out that themes don’t follow standards as well as thought they did, so the class I was using to access the widget wasn’t working. (If that doesn’t make sense to you, don’t worry, just know that if you’ve had issues in the past that it works now.)
Also, be sure to report that the plugin works in your theme.