Yes, I have the same issue with the
Assignment plugin. I manually updated the plugin, but that didn't work either.
The good thing is the team at VibeThemes provide great support and are always super responsive at fixing these little bugs. So one never has to worry about whether a bug is going to be rectified or not. They always come to the party with a fix.
Here's a link to assist with updating Visual Composer. Because of Envato's licensing policy, it's not always possible to have the latest version. Purchasing the plugin is the only way one can keep the plugin at its most current version continuously.