We fixed a djvu file adding some missing pages. Now, something strange appears. Take a look at http://it.wikisource.org/wiki/Pagina:Delle_strade_ferrate_e_della_loro_futura_influenza_in_Europa.djvu/206. Then enter in edit mode. The thumb showed in view mode comes from the old, wrong page; the thumb showed in edit mode is the right one.

Can we force purging of such old thumb/image, presumably saved somewhere from the old djvu file?