Videos Not Playing

[ Moderator note: moved to Fixing WordPress. ]

Hi there,
I have been using the huge it video plugin to create a video gallery on my site www.concept8media.com.au however, when I click on the video to view it, nothing happens. I am using the Video Gallery/Content popup viewing mode but nothing happens when I am on the website and click on the video. Previously, the video would pop up and play but now nothing happens. My website is finished and this is the only problem! Could you please help me fix this.

Kind regards,
Jake