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The error occurs in Chrome as well as Safari. The images appear to be consistent, but fairly random.
error: could not load image from https://upload.wikimedia.org/wikipedia/commons/thumb/0/02/Joe_Sutherland_photo.jpg/2560px-Joe_Sutherland_photo.jpg
user agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36
screen size: 1440x900
canvas size: 1397x690
image size: 5184x3456
thumbnail size: CSS: 1039x690, screen width: 2078, real width: 2560