moving folders and files in finder and changing the sidebar is unreliable

I have never tried to modify the finder other than using System Preferences or Finder Preferences

In System Preferences/Trackpad/Point and Click I have "tap to click" selected

I turned it off and I still have the same problem

In System Preferences/Accessibility/Pointer Control/Trackpad Options I did not have "Enable Dragging" selected.

That did not prevent me from dragging anything.

I enabled dragging and I still have the same problem.

To repeat -- the problem is that:

• • sometimes I can click/hold on a file and move it immediately
  • sometimes I click on the file to highlight it and a second click/hold will allow me to move it
  • sometimes no matter what I do, I cannot move the file

An "interesting" thing happened. While doing this repeatedly somehow I created a file with the same name as the folder I was trying to move. The file type was a "Text Clipping" and it had only the name of the file in it.

I believe I may have figured out the problem.

For years using the trackpad, I would click/hold with my thumb and then use my forefinger to move the file.

I did not have any problem until using Mojave

I have found that if I don't use my thumb but only click/hold with my forefinger, I have no problem moving the file.

I have disabled "tap to click". With click set to "light" tapping isn't useful for me

I have disabled "enable dragging" FWIW: I cannot determine that this does anything

Another "interesting" thing. Emails from "The Guardian" (The British Newspaper) -- and ONLY "The Guardian" do not allow me to scroll down using two-finger scroll. If I make a gesture that initially is a two-finger up and immediately scroll down it works. As long as I keep scrolling up and down, it will work. If I stop scrolling for a second and try to scroll down, it will not work unless I repeat the up/down gesture.