Recorded sound not working

Hi. i work in a small school and we use ipads in every class from 4 year olds to 11 year olds. The youngest childrens ipad has suddenly stopped playing back recorded sound on videos. if i put the video onto a pc or mac the sound works so i know its recording and the mic works. My guess is they have turned something on or off but i'm stumped as to what. Any ideas?

My first thought on this one is that you should do two things:
1- Make sure you are running the latest updates for your operating system
2 - Reinstall quicktime if #1 does not change anything.
Here is how to reinstall quicktime:
http://support.apple.com/kb/HT1925
i

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