I generally only access StackExchange at work. Sadly, I have to go through some sort of proxy server/firewall thing to get to the internet. I just found myself unable to vote on questions and answers. Did StackExchange change something, or did my corporate firewall? Just wondering so I can track this down on my end.
Try loading the links below:
Both should result in pages of script. If either one results in an error, that's your problem.
Also do a Ctrl+F5, just in case you're stuck with a bad cache.