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Hmmm...normally if you click on a Youtube link in mobile Safari, the YouTube app will open.

Maybe because they link to jp.youtube.com???

The jp suffix doesn't change the video, it's only for the language on the page. You could try creating a test page with both 'jp' and non-jp links to the same video, just to see what happens.
 
There's a mac virus out there that is off porn sites primarily that asks you to install some new codec. Figured I'd point that out. Not sure if this is the case with your youtube.jp issue.
 
There's a mac virus out there that is off porn sites primarily that asks you to install some new codec. Figured I'd point that out. Not sure if this is the case with your youtube.jp issue.

Theres only a few episodes that have that error messages, others are perfectly fine~:)!!
 
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