Topic: Can't fling from YouTube

I used to be able to fling from YouTube, but it isn't working anymore.  When I select the fling button, nothing happens - no menu, no message, just .... nothing.  I can still fling the video from the flingo website.  I was using Windows XP with Firefox when I first noticed this.  I have since purchased a new computer using Windows 8.1 and have tried with Firefox, and Chrome (latest versions of each) and none will fling YouTube videos.  Actually, I didn't get to try with IE as I couldn't get the fling button to drop to the favorites.