Thank you, that did the trick!
By the way, the Rprofile.site file that came with the R I installed from CRAN (R-4.1.2) has the following commented out line as a suggestion for changing the library location:
set a site library
#.Library.site <- file.path(chartr("\", "/", R.home()), "site-library")
I tried commenting out the .Library.site line, and restarting R, but that didn't actually work!
But your code from your blog post (using .Libpaths) did!
Thanks!