Large images not loading/no thumbnail

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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.)

dardomorph
 
dardomorph replied on at Permalink Reply
dardomorph
After changing platform, location and browser, the problem is gone. Obviously not a server-side issue.