I decided to buy your theme because it looks REALLY awesome and it has all the features that I need. The thing is, as soon as I activate the 'Apollo13 Framework Extensions' plugin my main menu isn't showing properly. It looks like the whole theme isn't showing properly. You can see it for yourself on mvdbphotography.com. The moment I deactivate the plugin, the menu is back as shown in your demo's. It does show properly while in 'Edit' mode. Just look in at my screenshot and you'll see what I mean.
And: can I change the text in the green button saying "Click here to scroll below"?
I'm on WordPress 4.9.8 and I meet all the hosting requirements that are needed. Also, I tried to do 3(!) fresh installs of WordPress.