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You have an error in the logout script as the prepared statement uses %d for the login id rather than %s. Can you please update the plugin.
if ( $details = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->dmtablelogins} WHERE id = %d AND blog_id = %d", $_GET[ 'k' ], $_GET[ 'blogid' ] ) ) ) {
should be
if ( $details = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->dmtablelogins} WHERE id = %s AND blog_id = %d", $_GET[ 'k' ], $_GET[ 'blogid' ] ) ) ) {