So, new iMac => can I assume you are running Leopard? What you describe sounds strange indeed. Can you post screenshots somewhere (http://drop.io/ ). Also I assume the icon at the bottom is unlocked? There is indeed no "Save" option in most Mac OS X applications. That is because the UI folks at Apple decided its superfluous... you made the change, so the assumption (on their part) is that you want to save it.
Also do you have NTP enabled? ("Set date & time automatically").
--ravi
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