By default the Total theme disables the Design Options tab from the Visual Composer (for several reasons). Which may cause a bug with some 3rd party plugins (I have only seeing it happen twice). The solution is very simple though.
- Go to Theme Panel
- Uncheck the box that says “Run Visual Composer In Theme Mode”
- Go to Visual Composer > General Settings
- Click the “save changes” button at the bottom (this should fix the error)
- Go back to the Theme Panel and re-enable the “Run Visual Composer In Theme Mode” (recommended).