The recent Wordpress update broke Visual Composer 4.7.
VC 4.11 is supposed to overcome this: https://wordpress.org/support/topic/wordpress-45-and-visual-composer-49-issues
If you’re having problems undating to 4.11 and it’s urgent you finish your site, you could try downgrading to the previous version of Wordpress.
Otherwise, have you tried deactivating and deleting VC 4.7 and installing 4.11 from scratch?
Be careful though - I don’t know if this might have negative effect on your work so far. Try contacting the plug in author for their advice.