Still consistent on my machine: Shut down times out when I logged in shortly before starting the backup, only then and always then, regardless whether the login is with or without (shift key) login items.
I noted the logs, and there is always the same message in system log at the moment when SuperDuper! gives the shut down command.
SuperDuper! log:
Code:
| 11:29:38 PM | Info | PHASE: 4. And Finally...
| 11:29:38 PM | Info | ...ACTION: Shutting down computer
| 11:29:38 PM | Info | ......COMMAND => Shutting computer down
| 11:29:38 PM | Info | Copy complete.
system log:
Code:
Sep 6 23:29:38 MacKanjer4 com.apple.launchd[1] (0x10baf0.nohup[1471]): Could not setup Mach task special port 9: (os/kern) no access
Sep 6 23:29:50 MacKanjer4 [0x0-0xdb0db].com.apple.systemevents[1478]: com.apple.FolderActions.enabled: Already loaded
Hope this helps.