Ok then. If none of the usual medicine, repairing permissions, running periodicals and a reboot, helps (and I doubt it here) I have only one suspect: Isn't that Desktop Manager i spot in your menu bar? Last time I tried that, that is a while ago I give you, it caused some erratic behavior on my iBook. No real bugs but just little things. Try quitting that, reboot, and see if the bug is still there...