I decided I'd see how a team with non-Latin characters showed up in the scoreboard. I can't remember which exact one it was. It's name was wholly Chinese characters and it plays at 6am Eastern time tomorrow.
Immediately after logging in, every link immediately returned Bad Request. I experimented a bit, and I was able to remedy the situation for following one link by deleting the sb_value cookie. Because it was immediately regenerated, the next link would be Bad Request again.
I was able to permanently get things back to normal by going one link at a time (clearing sb_value each step of the way), and removing the match of the Chinese-character team from my scoreboard.
BTW, it showed up as "???" in the scoreboard.