I have found a sequence of actions that causes the R GUI on Mac to hang:

1. Launch R GUI.
2. Open an empty *.R file via the button or menu or shortcut.
3. Add something to the file.
4. Save the file via menu or shortcut (technically a Save as…).  In the save 
dialog box:
  a. If you save in whatever directory is pointing to, everything works fine.
  b. If you attempt to change the directory, for instance by clicking on the 
icon for a folder w/i the current directory, one gets the pinwheel of death and 
R must be forced to quit.

Can anyone else reproduce this? 

Bryan

sessionInfo:

R version 3.6.1 (2019-07-05)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS Mojave 10.14.6

Matrix products: default
BLAS:   
/Library/Frameworks/R.framework/Versions/3.6/Resources/lib/libRblas.0.dylib
LAPACK: 
/Library/Frameworks/R.framework/Versions/3.6/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods  
[7] base     

loaded via a namespace (and not attached):
[1] compiler_3.6.1

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