[YouTube-API] Problems loading video in a YouTube JavaScript Player (can't load data from i1.ytmg.com)

I embed a YouTube video player in my site with JavaScript Player API but when I load videos form Firefox I can read in the bottom-left corner: "reading data from i1.ytimg.com" or "reading data from i3.ytimg.com" and when I click "Play" to start video for the first time the video does not start. In Explorer everything works.

--
You received this message because you are subscribed to the Google Groups "YouTube APIs Developer Forum" group.
To post to this group, send email to youtube-api-gdata@googlegroups.com.
To unsubscribe from this group, send email to youtube-api-gdata+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/youtube-api-gdata?hl=en.