I put the code into the Snippets plugin and Lightweight Grids Columns and WP Show Posts shortcodes now work in category descriptions. Is this code stable? I mean the post from stackexchange is nearly two years old. Will I have to check on this each time a new WordPress update is released? Here is the code I inserted:
add_filter( 'term_description', 'shortcode_unautop' );
add_filter( 'term_description', 'do_shortcode' );
remove_filter( 'pre_term_description', 'wp_filter_kses' );
What does remove_filter… do? I commented out that line and it still seems to work out.