My menus suddenly are all empty. I create new ones and insert entries but none appears. Did something break?
closed as too localized by toscho♦ Sep 30 '12 at 19:54
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I found the cause. I added in my functions.php an action for pre_get_posts which modified the posts query, adding a custom post type. This presumably crashed my menus mechanism. I removed this action and all back to normal.