Dear Tim Cross, I am referring to this message: http://lists.gnu.org/archive/html/emacs-orgmode/2019-03/msg00050.html and because I did not subscribe to the mailing list, a- I miss your reply and b- I am not able to directly answer to thread.
Well, thank you for your explanations. I think the culprit of my configuration is Helm, for the very reason you explained: it loads indirectly some Org, I guess. Now, I still do not have a clean workaround but al least I know the reason. :-) Thank you again. All the best simon