On Stack Overflow the last question was asked approx 1 hour ago. It is not getting updated. Since the volume of the users are a lot, I can't believe that nobody has asked question since last 1 hour. I think there is some problem.
Please look into it.
Edit : Now it is showing lastest question as 30 mins ago. But on the other hand same kind of problem is started on meta site. The active tab is not getting refresh with current discussing question.