Pretty straightforward - within the last few minutes I can't close any questions. I click the "Vote to Close" button after selecting a reason, and it shows as "Closing...", but it never closes. If I refresh the browser, I see a red error box saying "an error has occurred, please try again."
Also, the question I was viewing (https://stackoverflow.com/questions/18425322/how-to-handle-this-php-query#comment27069515_18425322) was at 3 close votes, now its at 1; i know you can rescind votes, but it might be related.