Custom Field values not Showing in Edit Page of Custom Post Type

Whenever in doubt about the functioning of WordPress functions, consult the Codex:
http://codex.wordpress.org/Function_Reference/register_post_type

There, we can see that when registering a post type the supports argument has many options, one of them custom-fields.

So, this would enable the CF box for the CPT:

$args = array(
    'labels' => $labels,
    'public' => true,
    'publicly_queryable' => true,
    'show_ui' => true, 
    'show_in_menu' => true, 
    'query_var' => true,
    'rewrite' => true,
    'capability_type' => 'post',
    'has_archive' => true, 
    'hierarchical' => false,
    'menu_position' => null,
    'supports' => array( 'title', 'custom-fields' )
);

Also, there’s a missing closing </div> in the function member_manager_meta_options.

[UPDATE]

I’ll mark this Q&A for closure as too localized. The problems with it are errors in the post meta key names and wrong reading of a variable values.

If the following debug info is dumped inside the function member_manager_meta_options, you’ll see why no values are being read (because they are being saved).

$values =get_post_custom($post->ID);
echo '<pre>' . print_r( $values,true ) . '</pre>';

So, a working function would be:

function member_manager_meta_options(){
    global $post;  
    $values =get_post_custom($post->ID);
    //echo '<pre>' . print_r( $values,true ) . '</pre>';
    $id = isset( $values["isprp_id" ]) ? esc_attr($values["isprp_id" ][0]) : ' ';
    $member_life = ( 'Life Member' == $values["isprp_member" ][0] ) ? 'checked' : '';
    $member_assoc = ( 'Associate Member' == $values["isprp_member" ][0] ) ? 'checked' : '';
    wp_nonce_field( 'my_meta_box_nonce', 'meta_box_nonce' );
    ?>
        <div class="member_manager_extras">
        <style type="text/css">
        <?php include('member_manager.css'); ?>
        </style>
            <div>
                 <label for="isprp_id">ISPRP ID</label>
                 <input type="text" name="isprp_id" id="isprp_id"  value ="<?php echo $id; ?>" />
            </div>
            <div>
                 <label for="isprp_member">Membership Category</label>
                 <input type="radio" name="isprp_member"  value="Life Member" <?php echo $member_life; ?> />Life Member
                 <input type="radio" name="isprp_member"  value="Associate Member" <?php echo $member_assoc; ?> />Associate  Member
            </div>
    <?php
}

And the problem of the post_meta key names is that isprp_member and isprpmember (and ispr_id as well) are not consolidated through the code. They are being used as Columns IDs and as Post Meta Keys.

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