Support youtube HQ button missing

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http://androidforums.com – Hello! So i just got the phone for like 3 days. it's awsome. when i got it as i was looking into it i used youtube and noticed it had a button to play HQ videos in the corner of the screen. now i notice that button is gone on every video. please help. Thank you! Note: i think youtube updated once since 1 got the phone but i'm not sure (General)