Hello
Thank you to all for your help.
Actually, for some bizarre reason, there must not be any subfolder in the Campaigns directory, otherwise DCS will only "see" the Campaign in the subdirectory and some, but not all, of the .cmp in the directory root.
It has probably to do with the parsing method to find files.
Never mind, do like MadDog says, clean /Campaigns/ of any sub dir and it works like a charm!
Thanks agin