can't make file/directory alias since last upgrade

Are you saying that you don't get this contextual menu when you Control (right) - click on an item?

Give this a try: boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.

NOTE: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

I only vaguely remember there being a shortcut for Make Alias, but I'm almost certain it was nothing like cmd-shif-A. I always just cmd-opt+drag to make an alias because I never need one in the same place as the original file.

The Keyboard Shortcuts article states that it is cmd-ctrl-A.

johnsankey wrote:

(I know I'm pushing 90, but I thought my mind was still working... 😾)

I'm dragging 80 and my mind seems to have a mind of its own at times. 😕