So I had to wipe my harddrive the other day, and after reinstalling Mavericks I started having issues watching videos on Netflix using Safari. It kept saying "Failed Plug-in". Initially I thought the issue had to do with Netflix. However, I downloaded Firefox and I had no problem watching the videos on Firefox. So I'm just wondering why Safari won't recognize the plug-in? And if there is a solution to this? The other thing I guess I should mention is the videos do play on Safari immediately after I reinstall Silverlight, but as soon as I exit the window or the video time's out and I refresh the page the error message appears again.