For example : http://www.goochelaars.com/threads/youtube-videos-niet-te-zien-met-ipad.14844/#post-128860
I tried it on my Ipad myself and it worked after about 30 seconds wait. (both in Safari and Chrome)
I tried it on an Samsung Tab 3 (both in built-in-browser and Chrome) with no result.
I only see some whitespace in the message.
Any idea what causes this problem ?