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The problem is still happening. On multiple computers, on multiple OS', on multiple ISP's, Firefox always works, Chrome (or Chromium) doesn't. If I manually click on each image, Chrome is fine, if I try using the keyboard shortcuts, the images won't load. 


Adblock isn't the issue, at least not for me. I have the same version of Adblock in Firefox and Chrome. It doesn't cause any issue in Firefox. In Chrome, I get the issue. If I remove or disable it in Chrome, I still get the issue. 


By process of elimination, I get two causes. Either it's Chrome/Chromium itself, or it's Imgur. 


It's not a big deal as I prefer Firefox regardless, but there are times when I'm using a computer that doesn't have Firefox (or I haven't/Can't set up Sync) and it's annoying that I can't use the arrow keys.