Soizic,
Thank you. I'm sorry it took so long to respond. I was on vacation for the past week.
Can you tell me the names of the ten images that you were having trouble?
Also, it appears that your Default Catalog has been deleted but Photo Mechanic Plus still thinks you want to work with it. Is it listed in the Catalog Management window? If so, you should expand it in the "Local Catalogs" section and click the "Forget" button to remove it from the list.
-Kirk