Resetting Safari ""If you use a shared or public computer, you may want to reset Safari to prevent other people from seeing what you have been doing.
Resetting Safari clears the history, empties the cache, clears the Downloads window, and removes all cookies. It also removes any saved user names and passwords or other AutoFill data and clears Google search entries.
In addition, any open windows are closed and a new window opens. The new window has a new history for the Back and Forward buttons and the SnapBack buttons."
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Removing the com.apple.Safari.plist file will do pretty much the same.
Sorry, to say you have to reset all your preferences all over again, add all the autofill items...etc
They should all still be in Keychains though, i think. I am not sure, I can not reset right now to check.
Sounds as if the portable is the one not functioning as should after a reset.