Do you see infinite loading (logo animation) when opening Frontend editor in WPBakery?
It seems there is a JS conflict between WPBakery Page Builder and 3rd party plugin. Try to disable all other plugins and see if WPBakery Page Builder works properly. If yes – activate other plugins one by one to determine which one causes conflict.
If you disabled all plugins and the issue persists please check if you use CDN service that there is no option to minimize or combine or defer javascript files.
