Can't seem to sort imagesBrowser Info Environment
Block was developed before the fileset ordering feature was added to c5. I've got on my (long) to do list to update my 30+ addons to support fileset ordering but I don't have a firm estimate of when that will be completed. In the meantime the easy workaround is to select individual images in the editor interface for this block rather than a fileset. Then the sorting will be very easy.
Hope this helps.