HANSMEX YOU ARE A GENIUS ! [:D]

the solution is very simple ... pfff ! [*-:)]
On KDE, an application manages the copy/paste : klipper !
I have desactivated this application and "bazinga", it's worked fine ! [\:D/]

Thank you for your big help, I can continue my project for my house with this simple, efficient and magnifique program SH3D ! [;)]

Best regards,