System Preference icons vanish after apps crash
After several apps had to be Force Quit (iCal, Safari ,Tapforms, Dorico) I restated and noticed that the System Preference icons vanished and also a very large back-up started on Time Machine.
Also several custom changes to window toolbars vanished. I had also been signed out of my apple id and have had to reset my password.
I am running 10.15.4
I just hope I haven't been attacked/hacked.
I attach an image of System Preferences with missing icons.
iMac 27", macOS 10.15