In HTML5 it works just fine here. Are you sure we're talking about the HTML5 mode here?

Because, if you refer to the youtube.js script that allows to turn Flash youtube links (the ones not available as HTML5 yet) into HTML5, then it was indeed broken a couple days ago by youtube changes, but i've update it at my site ( http://fabportnawak.free.fr/owb/scripts/YouTube.js ).