I have a Logitech Deluxe Keyboard Y-SU61 (PID: BT622DG0423, P/N: 867640-0125) and my operating system is Windows XP. My problem is with the key combination "Up Arrow + Left Arrow + D" - it doesn't work. There's no effect of it. I tried with another keyboard and it works with it. Maybe I need a new software/firmware version, but I didn't found it for this model.