The WordPress version 4.5 release broke Visual Composer, or is it the other way around.
People who updated to WordPress version 4.5 experienced a lot of major issues surrounding the page layout. The pages made with Visual Composer was completely broken, ie noting was displayed on screen.
1. Check your console to see if you have any weird errors.
This issue is fixed in Visual Composer version 4.11.2 released on 13.04.2016
1. If you have purchased the plugin directly from the vendor, you can update the plugin directly from the dashboard. 2. If the plugin was included with a theme you purchased. Ask the theme developer to update the plugin, and update your theme when it is released.