Yeh, Apple modified something, not me. Purposeful actions by Apple with the update! Stop trying to blame the user, this is Apple's fault with the update. 11.3 was working, 11.3.1 NOT!
Security updates are not disabled, they are installed when a user decides to update through system update, just because I decide not to install them automatically is my choice as I don't want something to get messed up without me deciding. (1)
I do not have to have Time Machine. (2)
No system modifications have been made by me. (3)
If Apple had better management and design then users would not have to use 3rd party kernels such as Turbo Boost (not the issue!) to manage battery life and save their legs from getting burnt as the comp gets hot - see YouTube and these discussion threads for 100's of complaints. (4)
SO, not my issue. The Apple 11.3.1 update is buggy and has caused this failure for Finder. I have not modified Finder!
Whilst help is appreciated, you are simply repeating details in a report I have sent that are not the cause. :-/