I upgraded to the latest version of the events calendar and events calendar pro, and our tag archive pages broke. We are seeing errors like this:
[Wed Sep 23 20:08:22.895805 2015] [:error] [pid 8866] [client 68.180.230.87:35435] WordPress database error Duplicate column name ‘post_date’ for query \n\t\t\t\t\tSELECT\n\t\t\t\t\t\tSQL_CALC_FOUND_ROWS \n\t\t\t\t\tFROM (\n\t\t\t\t\t\tSELECT DISTINCT wp_27_posts., IF (wp_27_posts.post_type = ‘tribe_events’, wp_27_postmeta.meta_value, wp_27_posts.post_date) AS post_date FROM wp_27_posts INNER JOIN wp_27_term_relationships ON (wp_27_posts.ID = wp_27_term_relationships.object_id) LEFT JOIN wp_27_postmeta as wp_27_postmeta on wp_27_posts.ID = wp_27_postmeta.post_id AND wp_27_postmeta.meta_key = ‘_EventStartDate’ WHERE 1=1 AND ( \n wp_27_term_relationships.term_taxonomy_id IN (514)\n) AND wp_27_posts.post_type IN (‘post’, ‘page’, ‘tribe_events’) AND (wp_27_posts.post_status = ‘publish’) ORDER BY post_date DESC \n\t\t\t\t\t) a\n\t\t\t\t\tGROUP BY IF( post_parent = 0, ID, post_parent )\n\t\t\t\t\tORDER BY EventStartDate ASC\n\t\t\t\t\tLIMIT 0, 14\n\t\t\t\t /* From [ww2.kqed.org/stateofhealth/tag/emergency-medicine/] in [/nas/wp/www/cluster-40276/ww2/index.php:17] */ made by require(‘wp-blog-header.php’), wp, WP->main, WP->query_posts, WP_Query->query, WP_Query->get_posts