My KM is no longer finding any image in any of the actions that find images. This goes for actions that wait for an image or any of the ways the Move Mouse action finds images.
all variations of fuzzyness, unique/best etc. tried in new, simple macros
I answered my own question. I had to go through this procedure involving quitting the KM engine and unchecking and checking permissions in system preferences.
There are a lot of reports of upgrading to 11.4 losing various security permissions.
As @ccstone notes, the permission system has been buggy since Mojave.
It is concerning that the permission system is so buggy - how can folks have confidence in the security system if the permission system for it is so buggy?