In most, if not all, cases problems experienced during a scan can be traced to a problem with the iPhoto library itself. Rebuilding the iPhoto library fixes that issue.
To rebuild the iPhoto library: 1. Quit iPhoto if it is open. 2. Hold down the Command and Option keys on the keyboard. 3. Open iPhoto. 4. Keep the keys held down until you are prompted to rebuild the library. 5. A dialog will appear with rebuild options. Select the options you want to use. 6. Click Rebuild to begin the rebuild process. This may take a few minutes to complete. Ref: http://support.apple.com/kb/HT2638
If you continue to have issues with ADD for iPhoto please contact us at support@ssoftltd.com