ciao,
dai un occhiata qui http://support.apple.com/kb/TS2538?viewlocale=it_IT
EDIT: la pagina è stata tradotta veramente male da quella originale in inglese http://support.apple.com/kb/TS2538?viewlocale=en_US
nella quale si dice che il problema deriva appunto da assistente migrazione (in quella italiana manco era menzionato):
This can happen if you used Setup Assistant or Migration Assistant to migrate time zone information from another Mac. Date & Time preferences may show that no time zone is selected and any changes you make to the time zone setting will not be saved. (When no time zone is selected, the time displayed in Mac OS X will be in Greenwich Mean Time, except for the World Clock widget in Dashboard which will display the correct time for the city shown on the widget.)
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