Wordpress sorting by multiple custom fields

Hi,
I have a website which has the following code in, this worked up until 3.8 but now does not, can anyone tell me why or offer another equally simply way to achieve this. Put simply I have two custom fields, the first of which could be null therefor I need to show the rest but sort primarily by the first field.

$args = array(
'post_type' => 'course',
'provider' => $term,
'posts_per_page' => 50,
'paged' => $paged,
'meta_key' => 'course_startdate',
'meta_compare' => '>=',
'orderby' => 'meta_value',
'meta_value' => $date,
'order' => 'ASC',
'meta_query' => array(
        'relation' => 'OR',
        array(
            'key' => 'course_startdate',
            'value' => $date,
            'compare' => '>='
       ),
        array(
            'key' => 'course_trainingtype',
            'value' => $date,
            'compare' => '>='
        )
));
query_posts($args);

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Many thanks
LVL 4
ScorchDAsked:
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Jagadishwor DulalConnect With a Mentor Braces MediaCommented:
Write your query string separately in a variable and run it
<?php

 $querystr = "
    SELECT $wpdb->posts.* 
    FROM $wpdb->posts, $wpdb->postmeta
    WHERE $wpdb->posts.ID = $wpdb->postmeta.post_id 
  .....................
.....................
..............
 ";

 $yourvariablename= $wpdb->get_results($querystr, OBJECT);
 
 ?>

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