Hello me again,
I could regenerate the local imagebox using what AndreasKnopke proposed a long time ago (post Wed Mar 16, 2005 8:07 pm) via the "filesystem" option and then the "viewer" command. Loading the folder of our imagebox took several hours, and the "viewing" the data took more than 6 hours. But now the imagebox is nice and complete.
I still don't understand why the regenerate button did not work properly.
Best regards,
Sophie