Syst Prefs->Energy Saver->Schedule - won't stick

I change my start-up/shutdown schedule, click the lock, but the info doesn't "stick".
If i go straight back into SystPrefs its the same, if I do anything else on the puter (open a file, open a folder and go back to SystPrefs its changed), and if I restart it changes even more!!
I ran Repair Permissions in case the prefs weren't being written for some reason but that didn't help.

Any ideas?

Thanks for the help.

Previously, C wrote:

I change my start-up/shutdown schedule, click the lock, but the info doesn't "stick".
If i go straight back into SystPrefs its the same, if I do anything else on the puter (open a file, open a folder and go back to SystPrefs its changed), and if I restart it changes even more!!
I ran Repair Permissions in case the prefs weren't being written for some reason but that didn't help.

Any ideas?

Thanks for the help.

Please ignore - i see there's a tech note at Apple about it....