How to display original image in Aperture 3

When I started Aperture 3, the original version and copied version like below were displayed but now only copied version is displayed.
Please tell me how I can make Aperture 3 display orgitnal and copied version.
Thanks

Is "Aperture➞Preferences➞Advanced➞Create new Version when making adjustments" checked?  If not, check it, and see if that produces the behavior you want.

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