3082 Views 3 Replies Latest reply: Jul 10, 2010 8:36 PM by Carolyn Samit
HI and welcome to Apple Discussions...
Uninstall then reinstall the most recent version of Flash which you need for YouTube.
Install the most recent version of Flash here.
Now repair disk permissions.
Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select the FirstAid tab. Click: Repair Disk Permissions. When it's finished from the Menu Bar, Quit Disk Utility and restart your Mac. If you see a long list of "messages" in the permissions window, it's ok. That can be ignored. As long as you see, "Permissions Repair Complete" when it's finished... you're done. Quit Disk Utility and restart your Mac.