If you haven't already tried the 'fix all ipad quarks solution' then it may be worth doing a Non-Destructive Reboot. Just hold down the Home button and the On/Off together until the screen goes blank and release them after the apple logo appears.. you will notice that it takes a little longer to initialise. May not help you at all, but IME it's always worth a try, and it does occasionally fix funny behavour with apps.