Safari blocking outdated Flash plug-ins due to security holes
 

Adobe recently issued a security update for Flash Player which patches an exploit that gave hackers the ability to take over a vulnerable system. Not leaving things to chance, Apple is now rolling out a hotfix for Safari that blocks outdated versions of the tainted web plug-in. If your system hasn't been patched yet, you may receive a notification when attempting to access Flash-based content. The prompt will then advise that a new software version is available. If you're running OS X 10.6 (Snow Leopard) or higher and Safari is your browser of choice, you may want to nab this update from Adobe. Otherwise the next time you go online, the internet might be a far cry from what you're used to seeing.

http://www.engadget.com/2013/03/01/s...flash-plugins/