Hi Xavier,
let it be god! After may try I will go back to the "good-old" 3.3 version. Tunes, for beginners the new versions are simpler but i have more fun with the old 3.3, itīs only works fine and only this interests me.
Sorry, I canīt sent the project or error code now to you, in the meantime I delete the newest versions (3.5+3.6) and reload the code in 3.3. It runs immediately!
But thanks nevertheless for your assistance!
Greets from Germany (the sommer come back here

)
Holger