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Safari? Refresh from the drop down help menu.Or Firefox? clear your cache, restart the mac then see, nothing wrong with YouTube.
its been awhile since I've been on my mac and safari.. the way to clear it has changed, sorry.maybe you can find the solution here. but yes, I'm talking about refreshing safari.. did you try a reboot of the mac?or you could get Firefox as your browser.https://www.google.com/search?client=safari&rls=en&q=refresh+safari&ie=UTF-8&oe=UTF-8