Hi Tom, Beast of a menu here – love it! No need for support either but may be worth including in setup documentation. (unless I missed it)
This is how the menu must be established in theme, stating theme location <?php wp_nav_menu( array( 'theme_location' => 'primary' ) ); ?>
Anything like this without stating theme location won’t work with Max Mega Menu (still works if not utilizing plugin) <?php wp_nav_menu( array( 'menu' => 'Main Navigation' ) ); ?>