I upgraded 13.04 to Gnome 3.8. Everything worked perfectly before the upgrade.
After the upgrade, I have 2 problems:
I can't turn off my computer from the menubar, but I am able to use the terminal to shut down the computer.
I can't use any of the other drives in my computer. When I do, it gives me this error message:
Unable to access "16 GB Volume" Not authorized to perform operation.