The last two or three times I answered some question in SO (the last 2-3 hours), I was asked for Human verification. Is this a new bug, eventually related to the resolution of Overactive spam-ku?
It's normal to happen from time to time, but now it was like as it gets triggered on all questions.
Haven't tested... and it's not a big deal.
EDIT: Conclusion
It was NOT a bug, It just toke too long to enter the answers and that triggers the bot filter.