My son was doing KR200 Phonemic Awareness: Identify Initial sound of z. The final "coloring" page was done, but when he went to click the flashing arrow to finish up, it wouldn't click. It wouldn't let him click any of the navigation type buttons. He tried it again today and the same thing happened. It was not a problem on the next lesson. Don't know if it is a coding problem with that lesson or what the deal was, but thought you should know.