Currently Being ModeratedDec 19, 2012 3:50 PM (in response to David_L. Folender)
Would you make sure you have the latest RAW camera support installed. You should be on version 4.03 which you can download here if it is not coming up through Software Update: http://support.apple.com/kb/DL1604
Then restart Aperture. If you still see issues, try Reprocessing Originals which is in the Photos menu.
Let us know if you still have problems after that.