[Zope] Moving a CatalogAware Instance

Hi, I have problems with the Catalog of a CatalogAware ZClass Instance. The content of the catalog just does not update, even changing content does not correct this. If I click on Update in the Cataloged Objects, all Objects are removed from the Catalog and I do not see a way to get them in again without reentry. I cannot rename the cataloged objects, because of the Error: Error Type: ValueError Error Value: Uncatalog of absent id 'Album/Anna/Taufe/Anna2' wich refers to the old catalog location. Is there a way to get the catalog reindexed correctly after moving or renaming it? Thanks Jochen