Same things with me. I’ve gotten lots of other videos to play, so I don’t know what’s wrong with this one.
It’s strange. I’ve never seen a video on YouTube before where you had to click on HQ to get it to play. I downloaded the video using KeepVid, and was able to get both the low res and HQ versions with no problems, so it’s not like the low res version doesn’t exist, it simply won’t play.