I have a bit of a problem with my PowerBook. I can't unmount or eject any disks, or disk images, using the Finder. None of the Eject icon in Finder window sidebars, Command-E, the keyboard Eject key, nor dragging to Trash have eny effect (although dragging to Trash does turn the Trash icon into the Eject icon). I can unmount or eject using Disk Utility, and apps that automatically eject disks (eg Toast after burning a new disk, or Photo Mechanic after importing photos from a camera's memory card) still eject or unmount disks as they are supposed to. I am not aware of anything specific that I may have done to cause this. I have repaired permissions to no avail. It was initially evident in 10.4.5, but the upgrade to 10.4.6 has not fixed it. Can anyone give me a clue what I can try next?