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I am sorry to hear that have had issues watching videos online while setting as full screen mode.
I thank you for the video provided; it explains very much your issue.
I have tested the same graphics controller using IE. and I did not get any issues at all. I have updated video drivers and updated flash player. I even loaded some video codec available on Internet such Klite.
Please test your computer with different Internet browser like Firefox or Chrome and make sure to update flash player and get video codecs.