Thanks Robert, I manage to erase all my previous computer, and it is much cleaner now.
For my 2nd question, I think that we are not talking about the same thing. When I launch Subsurface, the default profile is one I do not use and which is empty (no dive recorded). I choose another profile down the "Files" menu. See attached image: opiff.xml is not used, and I would like Thomas JCB.xml to be launched as default profile.
Regards