Mystery of the Disappearing Images

Hi there,
I started development on a site for a customer of ours, and part-way in, a number of images just disappeared from the front-end of the site.

I’ve utilized the Spa demo, and everything was working fine for awhile, when all of a sudden, a number of the images and content on the front end just stopped displaying. I even tried inserting a new slider image as well, to no avail.

I’ve tested a number of theories (including reinstalling WP), and am currently in contact with the host in regards to what I know to be a problematic plugin (Root Relative URLs), but just not sure if that’s the real issue or not.

Any theories or suggestions as to what I could do to combat this issue?

Thanks in advance!