Youtube. cant watch vid. no black box?

My youtube usually works fine. But today, when i wanted to watch videos. It does not play. Not even the black box appears. But somehow, I can play special videos like the promored videos and stuff. Where they have a different video box than other vids. I can also play those vids embedded on a page. But why not the... show more My youtube usually works fine. But today, when i wanted to watch videos. It does not play. Not even the black box appears. But somehow, I can play special videos like the promored videos and stuff. Where they have a different video box than other vids. I can also play those vids embedded on a page. But why not the others? The black box just doesnt appear!
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