See in each Browser which version of Flash it thinks it has...
Is Flash disabled?
Safari 5.1.7 for OS X Lion, Safari 5.1.7 for OS X Snow Leopard, and Leopard Security Update 2012-003 disable out-of-date versions of Adobe Flash Player.
Out-of-date versions of Adobe Flash Player do not include the latest security updates and will be disabled to help keep your Mac secure. If Safari 5.1.7 or Leopard Security Update 2012-003 detects an out-of-date version of Flash Player on your system, you will see a dialog informing you that Flash Player has been disabled. The dialog provides the option to go directly to Adobe's website, where you can download and install an updated version of Flash Player.
If you need to re-enable an out-of-date version of Flash Player, you can do the following:
1. Navigate to the /Library/Internet Plug-Ins (Disabled) folder.
2. Drag "Flash Player.plugin" into /Library/Internet Plug-Ins.
3. If the browser is running, quit and restart it.
In the last two days, every time I go to a website that uses Adobe Flash - I get a message that I need to update. I downloaded latest version and it still doesn't work. So even YouTube won't work.
"Downloaded the latest version" or "downloaded and installed the latest version"?
Open System Preferences. Click on the Flash Player preference icon. Go to the Advanced tab. Check Now. I forget whether it starts the installation process or just downloads the dmg file.