scheduled backup won't run

[deepfringe]

Yes if I do a copy now command it works fine. Just to check my state of sanity I have two identical Imacs in an office. Two users so they have some variations but the systems are setup the same. Superduper is working just fine on one of them, including the scheduled smart backups. One is fighting back. I have not tried quiting superduper, I think it has been left on for the most part. Any additional tests suggestions are welcome, its not asleep, the date is set right on the computer, the target disk is spun down, etc. I love how it is working on the other Imac, so I'll keep plugging away here until it works.

My operating system was 10.4.10, I did an update to 10.4.11 that included a firmware update (scary). No change.
The "identical" mac that does work is running 10.4.9, could this be part of it?

Frustrated in Palo Alto