Bad design in my opinion. I should not have to scroll down to get to the only place that I have found to get to the link for unanswered threads. In my opinion, it is not a good idea to make it harder to get there. I am assuming that you mean that this occurs in the active tab only because all the other tabs retain their down arrow irregardless of their position. I also greatly dislike that I now have to actually click on the arrows where before I could just hover over them. Hovering is easier on old fingers than actual clicking is.This is by design. The sub-navigation (the bar right below your red marker) has the links for the "selected tab". The arrow appears when you scroll down so you have access to those links down the page. If you click on any tab it behaves the same way.
Fonts have been slightly increased overall. Quotes have been adjusted as well.