This Was A Great App Till – Math Fact Master Review

My child has used this app for over 2 years to work on her math facts. It worked great till we started using on the new iPhone 6S. The numbers disappear from the bottom and the boxes that would contain 1-9 and 0 go blank as she progresses. Not sure why this is happening, but it would be great if the issue was corrected.
Review by LaProfesora on Math Fact Master.