Cannot install apps on iOS 6.1.2; can't get through the account security questions I bought an iPad with retina display yesterday, and this is my first iOS device.

After registering and connecting an Apple id, I tried to install some free apps.

But every time I press the install app button, there is a popup saying something like 'You need to setup three questions to improve the security level of your Apple id'(translated from Chinese). 

I clicked the continue button, then there is a page to choose questions. But when I clicked to choose the first question, it jumps to a blank page and I never see any further response.

But when I clicked the do it later(translated from Chinese) button, it just quit installing the app.

So neither way can I install an app.

I also tried to reset iPad but it still does not work.

The fact is that I already fill the three questions&amp;answers when updating to the current 6.1.2 version. I don't know why it asked me do that again.

What can I do to solve the problem?

UPDATE:

The problem magically disappeared this morning and I absolutely have no clue what the reason is.
You should first try reseting the phone.  

If that doesn't work, a few people had success in this Apple discussion thread with signing into their account on a different phone that did not have the latest version of iOS on it. 

So try signing into your account and setting your security questions from a friends phone. Then of course, remember to log off.