[R-SIG-Mac] "Workspace Browser" gives error message, no info

[Robert Chatfield]

I have been getting this message when trying to use a the Workspace 
Browser  on a previous R Gui install and the current release also. 
I do seem to get a browser when I start up (and it reads the .RData file in the home directory).
and from a smaller save file .RData  



Start R from Vim or from terminal (open -a R64.app or even 

open -a R64.app Figures_for_ARCTAS_fire_Cal.r
from the correct directory, followed by a menu-selected
"Load Default Workspace"



The general description --


(clear workspace via menu,
change working directory via menu,
load default workspace via menu or via command line)

Select workspace browser:
Blank page, message to console is
Error in if (nm[i] == "") nm[i] <- paste0("[[", i, "]]") : 
  missing value where TRUE/FALSE needed
Error in if (nm[i] == "") nm[i] <- paste0("[[", i, "]]") : 
  missing value where TRUE/FALSE needed

ls() gives reasonable results.

The following gives the same error:
open -a R64.app Figures_for_ARCTAS_fire_Cal.r
from the correct directory, followed by a menu-selected
"Load Default Workspace"

The workspace is about 10 Mbytes

Any ideas?

My setup : 

R version 2.15.1 (2012-06-22) -- "Roasted Marshmallows"
Copyright (C) 2012 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)

OS X 10.6.8 on a 2 x  6-core Intel workstation.