Not updating. Possibly caching?

I’m using the shortcode [testimonialswidget_widget category=college-commitments] to add a testimonials in this category to the home page of a site I’m developing. But as I add or remove testimonials to this category, or make text or featured image changes to the testimonials themselves, they don’t seem to get updated. Does this plugin use a cache that needs to be cleared?

By the way, I’m using the Premium version.

http://wordpress.org/extend/plugins/testimonials-widget/