I downloaded Adobe 11.5.502.149 from get.adobe.com/flashplayer. I am running on Mac OS X Lion 10.7.5, 2.7 GHz Intel Core i7. As of last night before bed (less than 12 hours ago) I was watching videos on Youtube. I get on youtube this morning, and find "blocked plug-in" instead of a video. So I click it, and download AND INSTALL the new Adobe Flash Player. When I go back to youtube, I get the same "blocked plug-in" message. I've reset Safari, I've looked through my preferences on Safari... at this point, I'm not sure what else I can do.