Happy to highlight my own stupidity, hopefully to benefit one other in the future. What privileges you have for a share are not the same as the actual directory, I know. no surprise. I share M: drive, checked M: drive for privileges and thought all was good but of course did not have write privileges to the share. All is once again good in the state of Denmark.
sorry
craig
ps: only thing that MC could have done to help me help myself was to have a better report, along the lines "I can't write changes here you ...."