I've written to the developers four times, called them three times, and written on this forum three times. All over the past two months.
I think it's safe to say that this plug-in is not supported any longer.
My issue was that the plug-in remembered information from its test home, and then delivered 404s in its new home but only for one link: the "read more" link under each testimonial that leads to the full testimonials page. I have spent hours trying to figure out the solution to this issue, and still haven't. Disabling and enabling don't work. Completely uninstalling and reinstalling doesn't work. Some file must be planted somewhere that is undocumented.
I'm switching solutions. And you should too.