I just had my site cleaned by Sucuri after being infected and after that was done I found that both this plugin and NextGen Scroll Gallery were not working correctly. I deactivated both, deleted both, and reinstalled. That fixed NextGen Scroll Gallery but JJ NextGen JQuery Slider is not working. It has been working great until this point. The site is: http://www.cheraustin.com and the slider is on the home page. It just shows the spinning circle. I've tried it in different browsers and I also looked at the source. The image links that the slider is using are correct as I can open those images.
I'm sure some side effect of having the site cleaned is at fault but I'm not sure where the conflict might be with JJ NextGen JQuery Slider.