MacBook Pro Safari 5.1.5 Lion 10.7.3 YouTube videos will not play in Safari unless I diddle with the settings -- resolution of the video or size of the window. When I click a video, I get a black window with the rotating circle. It's not buffering -- I have very fast Internet -- it will not play until I diddle. The same video's play, immediately, in Chrome and Firefox. Any ideas? Thanks. sjh PS. I think this happened after a Flash upgrade from Software Upgrade. I've gone to Adobe's site and installed the latest Flash. Since it works in other browsers, I don't see this as a Flash issue. Am I wrong?