Can't load Visual Composer

Are you using the latest version? 4.11.2 (or greater)? If not, update Visual Composer for compatibility with WP 4.5+

Just to add on sterndata.

You will NEED to update.

Here is Visual Composer’s recent changelog:
07.04.2016 – ver 4.11.2
– Added: Compatibility with WP 4.5

Source:
https://codecanyon.net/item/visual-composer-page-builder-for-wordpress/242431