I started gettting issues with the Youtube app on Android jelly bean. When I tried to play one of all videos, the app stucked at "there was a problem while playing this video. touch to retry" error message and then nothing happened. I have installed Adobe Flash and the mobile version of Youtube site worked fine with Firefox beta. Then I went to clear cache/data with youtube app in the setting and reboot, but still could not solve the problem.
How to fix Youtube app not working on Nexus 7 issues
* Install the Titanium Backup app from Goolge Play store.
* Open the app and tap on Backup/Restore tab at the top.
* Find out the YouTube app. Tap on it and select "Wipe data" button.