For some reason that I can´t explain I am unable to watch any youTube videos on my iMac. I have "click to Flash" installed and can watch flash content on all other sites. When I login to my account at youTube I also need to click to flash but then I get instead of the video, a "go Upgrade". I took this to mean that the flash player needed upgrading so I agreed to download the latest Flash Player and installed it. This has made no difference. I even went so far as to create a new YouTube account with a different e-mail address but nothing helps. Can anyone please give me some advice what I can do or try to get to watch the YouTube videos? This problem is only when I use Safari. Using Firefox I can watch youTube.