Whenever you have added, removed, or modified the images in an indexed catalog you must update its spatial index. If the catalog has an overview it is automatically updated when the index is updated.
To update the spatial index for a catalog:
Remember that clicking Save in the workspace only temporarily saves your changes until you click Publish or Discard. Clicking Publish sends all edits on all the configuration pages to the live Express Server. Clicking Discard overwrites all pages of the workspace with the current live configuration.