Yes, it's weird. Sometimes when I go to log out, I'm told that I "don't have permission to view this page" or the usual "not found" mesage, and then when I press the back button, I get a message that the site is down. Then, when I close the browser and reopen it and come back to the site, I find that I am still logged in. Eventually, my logging out is successful.
Bob, the not-very-computer-savvy-at-all