Comment 13 for bug 711571

"This bug was fixed in the package xfdesktop4 - 4.8.2-1ubuntu1"

It was?? I'm running a freshly-installed copy of Xubuntu 11.04 (with the latest updates, of course), and it's still doing this to me. When I click the Shut Down option, it logs me off instead. I tell my machine to shut down and I go to bed, then come downstairs in the morning to find my computer's been on all night doing nothing, sitting at the login screen.