I've got a YouTube video I'm embedding in an iFrame. Here's the embed URL:
http://www.youtube.com/embed/-3W3xvAcD2Y
In the current versions of Safari, Mobile Safari, and Firefox on my Mac I get a doubled video (3D version?) once the video actually starts playing, as shown below:
(Note: the preview image looks normal, you have to actually start playing the video before it doubles like this.)
In Chrome I get the correct version: 
Both are using the HTML5 player FWIW, and these embed links have been working for me until recently. I see the same results when actually embedding the links in an iFrame; it's just easier to link to the embed URL here. In my testing, I don't see this for all YouTube videos; it might be limited to videos that have been uploaded recently, but I'm not 100% sure on that (here's another example that shows the problem).
Any idea what is going on? Could this be an embed code error on YouTube that popped up recently? Give that URL a try and let me know if how it works on other browsers.
