Above The Fold Optimization plugin
This plugin is using a sort of loading, which doesn't always work with our slider. If you have the CSS -> Optimize CSS Delivery option turned on in it, then you should use our Delayed option, which would make our slider to calculate it's css positions later, after it loaded. But the JS -> Optimize JS Delivery option is just not able to load complex codes, like ours, so you shouldn't use that option. If you have a problem with the CSS too, if another plugin's css code, which was loaded by this Above The Fold Optimization plugin before ours had an error, that could mess up the next css codes, like ours too, so if the Delayed option doesn't work, you should turn off the Optimize CSS Delivery too. Or contact it's developer to improve his code.