Squarespace is forcing my HD video to display as if it were SD: http://www.youtube.com/watch?v=C8j0GOSr8C4

 

Squarespace also does not display this video produced by Apple correctly:  http://www.youtube.com/watch?v=SQl2FjaKCAQ

 

Curiously, Squarespace does display this video correctly: http://www.youtube.com/watch?v=uAKV57mQuls