Hello Balinor,
I tried it but it didn't change anything. I noticed that the first one had 's around the xcart-config but the other 2 did not. Could this change things? Obviously, I'm not an expert here. Thanks for you speedy help.
INSERT INTO `xcart_config` VALUES ('categories_desc_on_main', 'Show description under icons for categories on main page', 'N', 'Appearance', 500, 'checkbox', 'N', '');
INSERT INTO xcart_config VALUES ('categories_on_main_page','Show icons for categories on main page','Y','Appearance',500,'checkbox','N','');
INSERT INTO xcart_config VALUES ('columns_categories_on_main_page','Number of columns for categories on main page','','Appearance',510,'numeric','','');