Slider doesn't load - Minification plugin is used
Slider doesn't load, it's just an empty space, where it should be, and some kind of minification or cache plugin is used. (E.g. WP Rocket, W3 Total Cache)
Our slider usually works with minification plugins, but there might be cases, when the minified file isn't ready yet when the slider would need it (e.g. the file is large and loads slowly). You should turn on the Async loading at the Nextend settings, which will load our cache files in a different way.