I also am having trouble using the Advanced JW player on iPhone and iPad.
I need to display youtube videos in our website. These work perfectly on most devices. When it comes to these apple devices however nothing is displayed at all. The download link is disabled.
I have tried replacing the jwplayer.js to no effect. The other suggestions here didn't seem relevant to youtube. I'm not using play lists so that is not an issue.
It would be brilliant if I could sort this.
The webpage involved is
www.amicidance.org/index.php/repertoire
the site is still under construction
Crispin