Certain youtube videos won't play in Firefox

Firefox 20.0.1, windows 7, flashplayer up to date.

Certain youtube videos won't play. The advert beforehand plays, and then the video just displays a black screen, no loading, trying to skip to a later time in the video doesn't work. It seems to be certain youtube users whose videos won't play, users whose videos I was able to watch only yesterday. The featured video on the user's channel is watchable, but not when opened separately. IE won't show the affected videos either.

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