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Download Flash Player Uninstaller from this document :
Run the uinstaller and then install Flash Player 11.4 from here : http://get.adobe.com/flashplayer
I did what you have told me, and it didn't work out. Flash player isn't working, it's still the same problem. Is there anything else I could do?
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Could you please check the following:
In Safari, go to Preferences > Security.