I just upgraded to 10.13.4, and every time I reboot or login I get the "Setting up your Mac" screen. It also adds the default apps to the dock (such as Siri and Downloads folder). If I remove those two and log out or reboot, the next time I log in I get the same "Setting up your Mac" as well as the default apps again. This happens on two machines I have; a MacBook Pro and a Mac Pro.
Has anyone else seen this behavior and, more importantly, have a fix for it? Or is it just a bug in 10.13.4?