i have been looking in the forums for this and cant find it.
after i do a delta copy to my 2003 server i have to change the files with
chmod -Rv a+rwX /cygdrive/S/myfiles
inorder to read any of the file and dir's i have to use the above command.
i have tried to use the --chmod=a+rwX tag in the additional parameters and it does let me read the files in the root of the dir /cygdrive/S/myfiles
or in the dir pass myfiles ie /cygdrive/S/myfiles/test/
I got around that problem with -p --chmod ugo+rwX and it works well. Of course, it opens many security holes on the server end if you aren't the only one managing it. Try adding just -p to the additional parameters.