Modal box not working (visual composer, ultimate addons for VC).

Hey.

I'm trying to get a 'modal box' working and nothing seems to work. I have tried using separate modal plugins and the theme developers just told me to contact the plugin developer who told me to contact the theme developer. A bit stuck here, not really sure what to do.

Specifically when I click the modal boxes image nothing happens, no error or anything just... nothing happens. Not sure if this is something you can help me with but I'm all out of options.

Thanks a bunch.
-Ben