Christian, Just a quick note that all those software updates for the Aluminum Keyboard were for OS 10.4 (Tiger), as you can tell from the dates (a month or more before the Leopard release). I don't know whether there is a software update for the keyboards under Leopard, but those sure sound like all the problems you were having --- inability to log out and trouble with the function key behavior. If you have another, older keyboard, you could always see whether the problems disappear when you switch keyboards. And if the Tiger software updates aren't applicable now that you've done a clean install for Leopard, you could always try plugging the new keyboard in to a USB hub, instead of connecting it directly to your iMac. That seemed to fix shutdown problems for some people.
Cheers, Esther
