My parents own a MacBook Pro. They love to watch all kinds of YouTube videos on it through the Safari web browser. This past weekend, for no reason I can find, the YouTube homepage (and any YouTube video link I send to them) stopped responding. When I try typing in the YouTube homepage into Safari, a blank page appears, with the YouTube logo in the upper-left corner and an array of grey placeholders where video links should be. If I send a link to a specific video to them, and then click on the link using their machine, the video will play, but all the YouTube text and search pane and other standard page elements are greyed out. There is no way to access my parents' YouTube account in Safari on their machine. I tried posting this question on Google's product forums earlier this week, but to date there have been no replies.