ITunes is asking for payment info for a child's AppleID

Question

All iPads have been updated to OS8. Desktop is waiting for Yosemite. My child (age10) has had an Apple ID for many years with a false birthday. I am trying to get Family Share to work correctly and turn on Ask to Buy.  My child is the only member of my Family Share
After browsing support posts, I retroactively changed the date to the youngest possible (age 13) as many other parents have done.  Before the Family Share existed, I used to split the AppleID on my child's iPad so that I could share content. Many years ago, when I set up my child's personal AppleID, I set up her iPad with iCloud using her AppleID, and iTunes using mine so that purchases had to be approved and my AppleID could maintain all the kid-friendly content I'd been purchasing for years.  When I first set up family sharing, I forgot that iTunes will was using my Apple ID, so when I tried to turn on "Ask to Buy" I got a message saying 
"Cannot Enable Ask to Buy"
Adin is sharing purchases from an
account also used by another family
member. Ask to Buy can be enabled
only on accounts that are not shared.
So I logged out of iTunes on my child's iPad and used her AppleID instead. But then iTunes wanted credit card info for purchases, so obviously iTunes does not recognize that she is a child in my Family Share plan. I can't troubleshoot the problem on my Mac because Yosemite isn't available yet. I opted to leave my child's AppleID logged into iTunes, on her iPad, without payment info. I still get the same message when I try to turn on Ask to Buy for my child from my iPad.
HELP!

Answer 1

Run System Profiler.  Go to the Apple in the upper left corner of any window, then "About This Mac", then "More Info..."
Check under both Applications and Frameworks for Quicktime.  Applications are the actual Player application itself.  I believe Frameworks is the underlying system software support.  If you see something different there it might be that about which iTunes is complaining.  On my computer both say the same, but I'm not having the issue.
I'm guessing here but if you re-installed the system using Archive and Install,  your applications were left intact and that's why your Player is 7.7, but all your system software (includingQT framework) was replaced with earlier versions which may be why the you're seeing different versions.  iTunes doesn't need the Player, but it does need the underlying QT software.