Hi @Dan,
The menu is there, but because of the black background, it seems to be invisible. If you click on the upper left corner, the menu will slide in from right. I recommend you to change the color for the menu button. For that, go to “Dashboard=> Appearance=> Theme Options=> Color Options=> Menu Color Options” and scroll down to “Mobile Menu Color Options” and select white color for “Menu Hamburger Open Color” and “Menu Close Color”.
“Menu Hamburger Open Color” is for menu icon, and “Menu Close Color” is for icon to close menu.
Hope this helps.
Regards,
Mahesh