Product Page Buy button, and RevSlider

We have everything up to date, but are still running into some issues we can’t seem to figure out.

First issue is being able to place a Rev Slider on the site, for some reason we cannot get a slider to show. It was working before, now it’s just white. We have also tried using Layer Slider so it looks like the theme is having a hard time showing sliders.

Also on a product page, you can’t seem to see a Buy button when you select an item.

Sample page with a Rev Slider, and Layerslider, not showing – http://www.tahoetastings.com/sample-slider/

Sample Product page – http://www.tahoetastings.com/product/gift-card/