Sliders not re-appearing when don't show on page checkbox unchecked

I've had a persistent problem since I installed Slide In, which is that when I check the box to not show a slider on a given page and then later uncheck that box, sliders still don't show up on the page. I've cleared caches numerous times but never have been able to remedy this problem. It's now an issue bc I need a slide to show on a particular page and it won't. Any help appreciated.