Hi,

Please check again because version 4.0 doesn't do anything affect to Visual Composer.

Make sure you did activate Visual Composer.

If it still doesn't work, try deactivate all other plugins and try again.

After it work, let's enable each plugin to check the plugin caused this issue.

You should do that first for any bugs - like we said very clearly on the homepage of this forum. 

Best Regards,

PenciDesign