Post Query not working after updating to 4.1

I formed this query based on this answer.

I would appear this is no longer the way to do it… I reformatted the query to look like this:

query_posts(
    array(
        'post_type' => 'events',
        'showposts' => -1,
        'order' => 'ASC',
        'orderby' => 'meta_value_num',
        'meta_query' => array(
            'relation' => 'OR',
            array(
                'key' => '_ecmb_datetime',
                'value' => strtotime('today midnight'),
                'compare' => '>='
            ),
            array(
                'key' => '_ecmb_datetime_end',
                'value' => strtotime('today midnight'),
                'compare' => '>='
            )
        )
    )
);

Which seems to have solved the problem! If anyone has any other suggestions please feel free to share 🙂