Slider Revolution Blank

Hi. I just purchased this theme today. I installed the theme, plugins, demo content, etc. My issue is that any page that uses rev slider (eg. home page) is showing a blank space where the slider should be.

I have no other additional plugins installed. No Javascript errors in console.

Any idea why the sliders would not be appearing? I have tried both the demo sliders and creating a new slider. Nothing displays.

Unfortunately, I am testing on a local server so I cannot provide a link or a login.

Thanks for any help.