Comment 5 for bug 932177

As found in one upstream bug, you can use a temporary fix/workaround for Xfce by doing
sudo sed -i.bak 's/OnlyShowIn=GNOME;Unity;/OnlyShowIn=GNOME;Unity;XFCE;/g' /etc/xdg/autostart/gnome-keyring-*.desktop
Then logging out and back in.