Not that this helps any, but just as an update

I have reinstalled both R and TCL/TK, which has made no difference.

Running Ubuntu 11.10 in virtual box on the Mac, I have updated R and Rcmdr
to the same versions as on the Mac, and then successfully opened the same
Dropbox folder that crases R on the Mac, from Rcmdr on Ubuntu.

Note this isn't a Dropbox folder in the Virtual Machine, but the Dropbox
folder on the Mac.

So no  further forward than tying it down to being a Mac thing, rather than
a Dropbox folder issue.

Graham

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