After hitting "Install" to purchase/download an app, a warning dialog appeared saying something about improving security of my Apple ID - along with that came a suggestion to answer 3 questions. Think: "What was the name of your first pet?", "Where did your parents meet?"...
Now I understand and appreciate the security concern, but I had no choice but to run through this setup prior to continue to use the Appstore. So I made a screenshot of the questionaire, just in case sometime in the future I need to answer them on an Appstore login - you never know.
The absence of a "Back" button is way more serious for me, makes browsing the store almost impossible IMHO.