The thumbnails don't load properly in this overnight build. Firefox does properly load these same images.
Created attachment 17703 [details] Safari image of webpage dkbarto.deviantart.com
Created attachment 17704 [details] Firefox image of webpage dkbarto.deviantart.com
I reproduced this the first time I visited the site. The failed loads all showed up in the Activity window as "cannot find host", indicating a DNS error. Repeatedly reloading one of the image URLs in Safari did not resolve the issue, while the same URL loaded first time in Firefox. After running "dscacheutil -flushcache" to flush the DNS cache, it loaded correctly in Safari. I suspect this issue is below WebKit, as the actual network connections and DNS resolution are handled by lower layers of the system.
<rdar://problem/5629839>