comment lines sometimes removed from a function on exit from internal R editor

Dear All -
The problem: comment lines in an R function (lines beginning with # ) are *sometimes* removed on leaving the R default editor (same with notepad).
I'm working on a Windows machine with R version 2.14.1.
An example is below. Couldn't find anything that seemed to relate to this in the Changelog. I don't recall encountering this behavior with previous versions of R. Any suggestions on how to preserve the comment lines would be greatly appreciated. Many apologies if this is a stupid question. Cleridy

## this function has comments at the top:

mapsp.sqrtcpd.f

function (input.frm, cpd.numerator, cpd.denominator, basis.dim,

       npts, nyrs.unq, prop.ctch)

{

# here are some comments

# and more

#

       year.min<- 1975

......



## copy function to a dummy function:

tmp.f<-mapsp.sqrtcpd.f

## now edit it with fix and remove a ) so that it complains:

  fix(tmp.f)

Error in edit(name, file, title, editor) :

     unexpected symbol occurred on line 15 use a command like

x<- edit()

to recover



## and now recover it and add back in the ) that had been removed :

tmp.f<-edit()

## and look to see what happened... no comments at the top anymore..

tmp.f

function (input.frm, cpd.numerator, cpd.denominator, basis.dim,

       npts, nyrs.unq, prop.ctch)

{

       year.min<- 1975

......