System Preferences
When I open system preferences (iMac OSX Catalina 10.15.2) and open Desktop & Screen Savers the items under Desktop briefly open and then the tab becomes blank. I can't choose anything. When I quit System Preferences the and then reopen the same thing happens. Open Desktop & Screen Savers, items under Desktop briefly show up and then disappear. I'm left with a blank tab.
iMac Line (2012 and Later)