I can use "gnome-screensaver-command --lock" to lock my screen (running FC5). I have a crontab entry to do this at specified times. It was working until recently, when I started getting errors that say: "gnome-screensaver-Message: Failed to connect to the D-BUS daemon: Unable to determine the address of the message bus". It still works from the command-line, just not from the crontab entry. I have no idea what this error means or how to fix it. Suggestions?