Why won't this video render on youtube?

[Lego lad]

The video file itself if fine, but when I upload to youtube it just plays the audio with a black screen.

https://www.youtube.com/watch?v=RS13sbhpjVk&feature=youtu.be

[Ad Bot]

[Boink!]

uh fine for me

[Flatflyer]

blackscreen for me too

[Darksaber2213]

when I use &html5=1 it works
https://www.youtube.com/watch?v=RS13sbhpjVk&html5=1

[Lego lad]

it's working for me now too.
locking.