Starting this morning, I've been unable to vote or view more comments, or do most other actions. I've seen the same issue in multiple SE sites (Philosophy, Musicfans) and multiple browsers (FF, Chrome).
I am accessing SE from behind a work firewall, but I've never seen this issue before. The JS console indicates an issue finding the Stack Exchange JS object.
Is this a known, universal issue, or specific to me?
NOTE: I do not seem to be experiencing the same issues here in META.