tcltk, tcltk2, Rcmdr, Mac OS X

Monte,
I vaguely remember having exactly the same error message at some point in my
journey.  Why don't you try simply loading tcltk first to see if you can
then load Rcmdr:

library(tcltk)


  

Larry,

Oddly enough, I had tried just that before, with no success.  This time 
I opted to close out R.app and start fresh.  This time around it worked:

 > library(tcltk)
Loading Tcl/Tk interface ... done
 > library(Rcmdr)
Loading required package: car

Rcmdr Version 1.4-7


Attaching package: 'Rcmdr'


    The following object(s) are masked from package:tcltk :

     tclvalue

 >

Man, I'd forgotten how fugly plain ole X11 was compared to Aqua... ;)

Thanks,

Monte