In the past (on all SO sites, including this one), when I clicked on a link it changes colour to signify that I've viewed it. This allows me easily to see where I left off reading prior in the list as well as if I've viewed questions before.
I noticed today I clicked into a question and there was no colour change on return to list or after hard refresh of the page. Was this a chance (intentional or otherwise)?
I did not have the same problem on Stack Overflow (main), rpg or arqade (3/3 I checked) so seems to be here specifically, thus assuming not my webbrowser either (which currently is Safari on MacOSX if it matters).