Different user maybe a different approach

Why not try this on just 1 website

Do a save as of your website rename it mytestsite and upload it to a subdomain.

Set up a subdomain testsite1.yourdoamain.com, ALLOW TIME FOR SUBDOMAIN TO PROPOGATE, and new set of ftp settings :: public_html/testsite1/ and use the inbuilt FTP within VSD to upload and see if it gets it all OK, if not remove the public_html/ and try again

It will be easy to remove it later with direct or free ftp as you know its in a completely new folder.

I just have a suspicion this is all due to using an outside ftp program and then your viewing it with some sort of cash issue displaying as its always uploading to the same place.

And obviously if this works delete the genuine one completely do a save as and re name, and then upload with the inbuilt ftp to public_html OR NOT as test proves works for you.

Looks like you've made some progress, I see backgrounds and images on the MKS and Red Brick site

As Eric noted above, 1860px is a really wide page. This will require many viewers to scroll sideways as well as vertically. Not a good thing for small screens, phones and pads.
One other thing, it's best to size your images before inserting them into VSD (or any website). They're a bit slow to load and if one has a slow connection to begin with, they might not ever see them. The way they are now, VSD has to scale them down from the original image size whenever the page loads.

What did you figure out to get your images and backgrounds to show?