Youtube video direct and Get youtube download url

[dave]

Oddysey:

Like I said before, "/embed/" works for me but not "/v/" which gives nothing but a blank, black screen.

So:

This isolates the video in my browser:
http://www.youtube.com/embed/C_Kh7nLplWo

As does this:
http://www.youtube.com/watch_popup?v=C_K...autoplay=0

This used to work for me but after youtube changes now gives only a blank, black screen:
http://www.youtube.com/v/C_Kh7nLplWo