The start button works just fine. What you are seeing is a spot where an ad might appear. We discovered that were were making almost no money on mobile so we changed the ad setup.
As always, I highly recommend JetPunk Premium which only costs $1.11 a month.
Personally I see no problem with it. It should be the most prominent thing on the page, as that's what casual users want the most - how to start the quiz. It is just because you are not used to it that it feels strange, overall I think this is a very good change for casual players.
Glad to hear your detailed take Stewart. However, the whole new UI isn't really better for the quizzes. I just feel that the user should see the quiz straight away and not 2 ads before it and 1 in it (in multiple choice). Just my opinion tho, with no regard for revenue
As always, I highly recommend JetPunk Premium which only costs $1.11 a month.