My screen saver - that shuffles between a list of files in a folder - have stopped working after I updated to 13.13.3. When the screen saver starts it shows a black screen with the following message:
"You cannot use the iLife Slideshows screen saver with this version of macOS. Please contact the vendor to get a newer version of the screen saver."
Also my screen saver preference pane have stopped working - it simple does not switch to that screen when I click the "Desktop - Screen saver" button.
I have tried setting the screen saver using the terminal and the defaults command to update the plist file.