Safari Does Not Play Youtube Videos

Hi,
I updated safari to the latest version (6.1.2) on my MacBook Pro (10.7.5) and now it does not play any Youtube videos at all. All I get is a black space instead of a video - neither video nor audio.
Does anyone know how to resolve the issue?
Best,
maybug

Go step by step and test.
1. System Preferences > Other/ Flash Player > Advanced > Delete All
     Press the "Delete All" button
     Install Adobe Flash Player.
    http://get.adobe.com/flashplayer/
    Follow the prompts. Quit Safari.
    Restart computer. Relaunch Safari.
2. Allow Plug-ins
    Safari > Preferences > Security
    Internet Plug-ins > "Allow plug-ins"
    Enable it.
    Press " Manage Website Settings" button for more options.
3. Check whether you are currently in YouTube HTML 5 trial.
     http://www.youtube.com/html5
    At the bottom left of the page uncheck the box beside
   "You are currently in the HTML5 trial".
4. Reset Safari.
    Click Safari in the menu bar.
    From the drop down select "Reset Safari".
    Uncheck the boxes beside all items.
    Check the box beside "Remove all website data".
    Click "Reset".
5. Turn off Extensions, if any.
    Safari > Preferences > Extensions
     Now try YouTube.
Best.

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