Yeah. The copy has the same issue. I also exported it and imported it again and it still doesn't work. I'm really starting to think there is something else wrong with our install because my colleague is having the same problem with Youtube pages in other LOs. She says that when she starts a new LO it works fine for about the first five pages then it stops saving (due to this issue).
I can add the Youtube links directly into the template.xml using a text editor, save them and they display fine. Just realised this today so I now have a workaround. It's far from ideal though because my colleagues won't be able to do this and then I'll end up having to add all their videos!
www.dropbox.com/s/ab7vk7mnxnow38v/Future_Computing.zip
This is the LO that I'm having the problem with. The page is "The Internet of Things" but the youtube code isn't in it because it wouldn't save with it. The video I was trying to add is
youtu.be/sfEbMV295Kk but try any youtube.
Thanks for all the help.
Karl