I still have this same problem. It persists on my site even though I also have all the requirements verified and am on the latest version, in my case: Version 6.0.3
This is happening with mine too.
I use ThemeOne Mobius theme with Visual Composer, although on this particular post where I am trying this plugin, I am using a normal WP post type to test.
I get an infite spinning gear.
Same problem for me. Repeatedly gives me the notice.
