Ok, since I have been on Sophos UTM 9 (9.005-16) currently, I have to take a machine out of the skip transparent mode list or it will never play an HD Youtube video.
Even more boggling, if while you are out of the skip transparent list, and then try to play a trailer from say IMDB, Which I already have an exception rule for, videos will not play. Add machine back to transparent skip list, refresh IMDB page, voila video plays fine. Go back to yourtube attemp HD video, nothing, progress bar just sits there. If you change to lo-def video it will play fine.
I'm stumped as this seems to defy all logic of the entire proxying concept.
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