Hi, I upgraded the plugin on 05 Sept 2013 to version 1.3.2. It was working wonderfully before. I am now having the same problem as another recent support request. I used the same code that you provided as a fix and updated the testimonials.php file.
Unfortunately, it did not fix the issue. I am using the Genesis framework with the Focus child theme in this website. (the rotating testimonials are in the lower part of the left-hand sidebar.
Any suggestions are greatly appreciated to get it working again. Thanks!