I have recently taken over a 2017 MBP from a colleague. Apparently I was given a complete base re-install of OSX and upgraded to High Sierra, i.e. all previous custom configurations were reset. However I am unable to change my screen saver from Flurry, to any of the others provided by OSX e.g. Nat Geo.
I created another admin user (i.e. with same permissions) and tried it as that user, and still the same problem. I have full admin privileges and cannot change my screen saver, wow. Seems then this is a system issue, not user specific.
com.apple.screensaver.plist from both my account and the system but no joy.
Any idea how to solve this?