It seems suddenly about half of my "Bookmarks" of YouTube videos will not load and play. The page comes up, with the usual large black window, but it that won't load a video. Nothing I can do can make it play. As well, on several Web sites and pages when there is a YouTube link, again the page will come up but the video won't load. I'm on a Mac/w 10.6.8. Any ideas? I don't know that I've done anything unusual; this sudden stopping of videos loading just happened the other day. Now about half my Bookmarks will not work, nor half the links I see. Any ideas what this could be?