Hi Utu. One more time - you can safely delete the 2 .desktop files. If you want to know where all they come frrom - the starting link in /etc/xdg/lxsession/LXDE/autostart came with your last update of lxsession and is in conformance with the new pcmanfm2. The original starting .desktop file for polkit is /etc/xdg/autostart/policykit-1-gnome/polkit-gnome-authentication-agent-1, I am not sure about the one that you have in your home folder, but it was not originally there. One thing is certain, that is you should only have 1 starting link for policykit-1-gnome/polkit-gnome-authentication-agent-1 otherwise errors occur