Been working on a site started with a fresh install of 8.0.3 for a bit over a week. Everything great until today. Logged in today and all of my banner images (the site's largest images) won't load on the page (banner set with attribute) and show as a broken image link in the file manager. The sudden and arbitrary phenomenon has me stumped. I'd greatly appreciate any suggestions.
(Re-check permissions, rescanned images, cleared cache; all to no effect.)