ok, you seem to have two kind of trouble, the first one come from me(my bad).
First update the networkmanager-66serv and sddm-66serv packages. then disable and stop your networkmanager and sddm service. This should be done on console like tty2 or tty12. So,
# 66-disable -S -t root networkmanager sddm
then enable it and start it again
# 66-enable -S -t root networkmanager sddm
ok now networkmanager and sddm should be started after dbus.
The second trouble come from permissions problem. Please read this post :
https://forum.obarun.org/viewtopic.php?id=775 and this will solve your trouble.
Do not hesitate if you have any futher questions