Featured Slider Stopped Working

I installed the featured post slider and it worked perfectly. One day away from the site and when I logged back in the slider has ceased to function. I tried changing to the category featured slider and that will not work either. Other than that no settings had been changed. There used to be a center row of dots to indicate the number of posts I had in (5) and that has now disappeared, replaced by arrows on the right side of the image that do not function. Help!