While trying to install this flawed new apple keyboard on my Previous generation C2D 20" imac my dock has broken. The dashboard icon is messed up, I can't right click anywhere on it. I can add icons to it but cannot remove them, when I try to drag an icon off the dock it pauses and then appears to re-launch. I've deleted the pref files, tried re-installing the combined 10.4 update but still no luck. Any help please?