In case of the Evergreen Catalogue system acting up weirdly for a long time, or not working at all, there is an emergency reset button accessible to librarians. It is hosted at https://catalogue.rietveldacademie.nl/bibliotecaris/reset/.
Please use it carefully and only once. If things do not go back to normal functioning, get in touch with Infrastructural Manoeuvres. Please describe precisely what is not functioning, take note of the timing of the issues, if necessary take screenshots. And please add the description of the issue to the Ticketing system!