It looks like a bug. Both /etc/xdg/autostart/beagled-autostart.desktop
and /etc/xdg/autostart/beagled.desktop has Exec=beagled which probably
is wrong.
** Changed in: beagle (Ubuntu)
Status: Unconfirmed => Confirmed
--
beagled has two instances in the Gnome Session
https://launchpad.net/bugs/78432