Hello Jean-Pierre,
Thank you for your post.
It looks like you're using PHP MySQL Bridge connection to your remote MySQL database and the local copy of the database has been corrupted.
Please try to open Preferences of Store Manager and rename the local database name:
http://screencast.com/t/We15pLXVUo3D in order to create a new copy and then click at "Test PHP Bride connection" button and "Create and Get Data":
http://screencast.com/t/lpz9tcKsb