I sometimes get lockups with MagicMenu on the below system.
Pretty rare but its a total system freeze. Pointer doesn't move. Screen switching doesn't work. I attributed it to an older version of Phase5 SCSI device in combination with MagicMenu as I would wait for the drive to spin up out of sleep and then click the menu and then it would hang.
I don't work directly on my SCSI disk anymore and since then I have no hangs...touch wood. But I also upgraded 1230scsi.device to latest version.