Could you run the 'xmodmap' command in a terminal and paste the output? I suspect that the code we use to filter out Num Lock, Caps Lock, and similar keys may not be working correctly for your system (see bug #633104)
Could you run the 'xmodmap' command in a terminal and paste the output? I suspect that the code we use to filter out Num Lock, Caps Lock, and similar keys may not be working correctly for your system (see bug #633104)