YouTube video covered by a black square, video is playing but obstructed.Caused by CSS

YouTube video covered by a black square, video is playing and controls are working but obstructed.Caused by CSS .I tried disabling css and the video is visible, removing or changing
position: relative in #watch-player embed
or
display: block; in #movie_player
using firebug also works.
edit:
I also tried using a portable version with no addons and it works
possible addon related i will try to see witch addon

After much experimentation i tracked it down to the userscript known as
Youtube HD Ultimate.

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