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[Moved the discussion to Flash Player Forum]
You might want to Run the Flash Player Uninstaller and remove flash player.
Restart the machine.
Download and Re-install Flash Player.
Restart the browser and check.
Check the same using an alternate browser like chrome and see if you get the same issue.
I uninstalled Flash Player and that was the fix.
It's still the only fix and it's 3 years later.