We are writing this post of a long day troubleshoot with Visual Composer. We have been using a theme for most of our customers. Visual Composer suddenly started to give the trouble by not loading. It took many hours for us to analyze the issue and finally found the solution. You will get this issue mostly when you have Visual Composer 4.6 and WordPress 4.5.1. It may sound simple that you have to upgrade Visual Composer to latest release. May be this post helps someone 🙂