q() hangs

[Rich Heiberger]

This is a known bug.  It falls on the interface of R and Emacs.
It has something to do with R and emacs not agreeing on which has
responsibility for a file handle.

I can't duplicate it right now on the same setup you are using.
I believe the .RData is correctly saved.  I believe the hang comes
when R is trying to quit, after completing the save.  Therefore,
killing Rterm from alt-ctrl-del does not hurt anything or lose any data.