Hey Linc, you are truly a Marvel, i went through the process of logging in a Guest User, what a bloomin game that is, i couldnt use much at all, but i eventually managed to create a file and DELETE it, i also managed to open a Finder Window despite there not being any files to see anyway. LOL.
While in the Guest User Mode, i did note that:-
a Single Tap on both Finder and Trash icons worked as i expected !.
a Double Tap on both Finder and Trash icons DID NOTHING.....
so rather cautiously i Logged back into to my MAIN ADMIN account, i couldnt believe it, NOW both of my Finder and Trash Icons behaved normally.
Consequentally i didnt bother with your Second Option
perhaps it was just a case of Re-Booting, which i dont do very often, my Lap Top is on Stand By or SLEEP whenever i am not using it and it also permanently plugged into the mains.