Date and time syncing w/AD managed accounts

Hello all,
I am having a problem with managed accounts OS X server 10.4.1 up to 10.4.5 and clients in the same version range, though I suspect the answer to this is unrelated to version.
Managed users have access to some preferences, including date and time, which is set to automatically sync with a timeserver. With our ibooks (summer and fall 2005 production fwiw) the problem manifests itself when the user allows the battery to fully discharge. Date/time reverts to 1969 or so, and when the user plugs back in and logs in the time will not sync to the server. If I log in under an admin account the time syncs normally but I need for it to sync under the managed users and suspect that there is something very simple that I am missing here. I would appreciate any help you can provide.

Thanks,
Roger