I did and reinstall every from scratch using all the plugins that comes with it. I clearly shows that your theme itself is not compatible with visual composer 4.4.2 that you provided. When I try to switch to wordpress default theme visual composer works fine.
It takes really slow to load the customise page. I purchase these theme from envato. Could it be the files that they provide is not updated. Appreciate if you can provide me the updated version that really work. Thank you.