George, thank you for that really quick reply and. I haven't tried nothing yet because I don't have the keyboard here right now. I will do it later.
About the calibration of the screen, that's exactly what I did. I user the stylus of my palm and I had to press each point for about 10 seconds before being prompt to proceed to the next point.
Do you have any idea how did I lose the one touch setting? Or why when I press the empty One touch button all the Tone buttons turn empty? It is bizzare behavior I think and I hope that the company will be responsible enough to supply me with another keyboard while mine will be at service (if that will be necessary of course)... Do you do such things in US?