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Is this the first time you are using the app? If not, is it some videos that don't play and others do? Have you tried closing the app, remove it from the springboard and then reopen?
 
Hi,

Thank you for reply. I can play other videos but i'm not able play videos thru Youtube App. Yes, i have closed the app and tried but did not work. i will try removing from the springboard and then reopen
 
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