Adding X-GNOME-Autostart-Phase=WindowManager to /etc/xdg/autostart/gnome-power-manager so that g-p-m loads before gnome-panel seems to fix it, but I'm not sure that's a good idea.
Adding X-GNOME- Autostart- Phase=WindowMan ager to /etc/xdg/ autostart/ gnome-power- manager so that g-p-m loads before gnome-panel seems to fix it, but I'm not sure that's a good idea.