I recently lost all capability to access imgur.com links (however i.imgur.com links work just fine). I have tried: different browsers (Chrome, Firefox, IE; all the latest versions); Changing to a public DNS (22.214.171.124, 126.96.36.199, and 188.8.131.52); Clearing the computer's DNS cache via command prompts; disabling my windows firewall; and clearing all internet history and cookies. Nothing has worked so far. I should note that I'm on a work network through a university, and a coworker that sits near me has no problem accessing the site and all related content (a problem with my computer?). I also have performed a tracert for both imgur.com (times out eventually) and facebook.com (connects successfully) that I can post pictures of if that would help.
imgur's main site is on a different CDN (CloudFlare? Amazon Web Services?) than i.imgur.com (EdgeCast). You may just be having problems getting to that one CDN.