Richard Wint on "[Plugin: WordPress SEO by Yoast] Titles suddenly double posting and can't seem to fix it"

After playing around more I managed to solve my particular problem.

I had to amend my header.php, it was:

<?php
	wp_title( '|', true, 'right' );
	bloginfo( 'name' );
	// Add a page number if necessary:
        if ( $paged >= 2 || $page >= 2 )
        echo ' | ' . sprintf( __( 'Page %s', 'sicwp' ), max( $paged, $page ) );
?>

I just removed bloginfo( 'name' ); and the titles stop repeating.

Hope this is of some use to someone...