I don't know... here's that link on my forum:
http://www.juot.net/forums/showthrea...28#post1015228
It worked fine. But I think I see what might be the issue... The period in youtu.be I didn't 'escape' - that is it should be youtu\.be in the code. Some versions of php might require this while others don't.
I made this change and this is the updated definition. Delete the old one.