This has happened a few times now. On my Macbook Pro, when burning a dvd it doesn't eject when it is finished burning.. in fact it doesn't even show up on the desktop. I have to use ituens or disk utility to eject the disk. Even if I put it back in the disk will not show up on the desktop and I cannot play the dvd through the dvd player. It will, however show up in disk utility. All is fixed when I restart.