Good morning, (I tried to send this email before, but I think something went wrong. If it did send, apologies for the duplicate.) I am responsible for a small private library and we have recently installed Koha (20.05.04.000, using UNIMARC and UDC). I am having some issues with the shelf browser and the classification source. The shelf browser does not appear. When clicking on the link, only a link to "close the shelf browser" does. I have just finished assigning shelving locations (995$e) to all items (due to previously having periodicals show alongside books), and for this purpose I have created 3 locations: geral (general), referência (reference), periódicos (periodicals). Before assigning the locations, the shelf browser would sometimes appear; now it never does (only the link to close it, as mentioned above). What could be the problem? I’m not sure if this is relevant and could be impacting the shelf browser, but our search doesn’t work -- it always shows no results (our IT team is working on it). A second issue (that might be related) is that although I am trying to work with UDC, I think Koha is still defaulting to Dewey. I have only found out about the setting DefaultClassificationSource a few days ago, and it is set as Dewey (I didn’t change it because I would rather change everything, including all 1000+ items, at once). On the administration menu > classification sources, I only have UDC as ‘in use’. What do I need to do to make sure all of Koha is using UDC? I am very new to Koha, so any help is appreciated! Thank you. Kindest regards, Inês F.