I got it as well, in FF. Most of the time, these things get a one-strike-and-adios policy for me, but on this it seems important enough to try again later...
F^(#!~& server-side browser filtering... >:-(
Notice the bar on the bottom showing I'm signed in. And the prompt to sign in before I can vote.
Can't seem to get past that no matter what I try. I'll try IE, I guess.