Solutions
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jschenk's post in Default panel state is not loading at startup was marked as the answerNo nothing installed of that kind.
but....
I tried a repair install of P3D: No luck
I tried a repair install of PMDG: No Luck
I uninstalled PMDG, manually removed the folder PMDG from P3D and then reinstalled PMDG: OK !
Of course I lost some setting, skins etc for the aircraft, but at least it is working again .....
As an IT guy I hate so say that I don't know what was wrong, but sometimes the end result is more important
Jacques