Thinkpad X41 key 234 is interpreted suddenly as button-1 (mouse)

Hi I am running Kubuntu 10.04 with trinity 3.5.13, the keys which are sitting above the left and right arrow were recognized by xev as 234 and 233 and I mapped them via xmodmap. keycode 234 = F30 keycode 233 = F31 However out of a sudden, the right key 234, is now interpreted as a mouse button, button-1, even by xev. I restarted the Xserver rebooted the machine, no change. I am desperate. Anybody could help me please. thanks Uwe Brauer