[R-SIG-Mac] Blank help window

[zListserv]

I recently migrated to a MacBook Pro (15-inch, 2018) using the Migration Assistant.  Everything went well, though there are always a few things that don't transfer such as applications installed by Brew which I installed manually.

An issue with R arose I can't solve.  The help systen opens with a blank window.

Help works when I run R from the terminal so I know the files are installed.  Help works fine on the Macintosh I used a the source for the migration so it isn't a problem I inherited.  Re-installing R (see sessionInfo below) didn't solve the problem.

Anyone have any suggestions how I can get help to work?

R version 3.5.1 (2018-07-02)
Platform: x86_64-apple-darwin15.6.0 (64-bit)
Running under: macOS High Sierra 10.13.6

Matrix products: default
BLAS: /Library/Frameworks/R.framework/Versions/3.5/Resources/lib/libRblas.0.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/3.5/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     

other attached packages:
[1] HANDLS_0.34 zUtil_0.121

loaded via a namespace (and not attached):
 [1] Rcpp_0.12.17    lattice_0.20-35 digest_0.6.15   MASS_7.3-50    
 [5] chron_2.3-52    grid_3.5.1      plyr_1.8.4      xtable_1.8-2   
 [9] DBI_1.0.0       RSQLite_2.1.1   sqldf_0.4-11    blob_1.1.1     
[13] sp_1.3-1        gsubfn_0.7      proto_1.0.0     tools_3.5.1    
[17] Matching_4.9-3  bit64_0.9-7     foreign_0.8-70  bit_1.1-14     
[21] compiler_3.5.1  maptools_0.9-2  memoise_1.1.0