Keypad/Numpad gone mad in KDE4

I upgraded to KDE4 – Kubuntu Karmic Koala (9.10).

All was fine, excepting for the numerical keypad. My notebook's design includes this keypad which allows me to use the digits (when NumLock is on) and the other keys, respectively (Del, Home, End, Page Up, Page Down, Ins) – when the NumLock LED is off.