That is quite a powerful plugin you are using. I am sure that you have already checked the obvious title settings, and all of your forced title rewrites are correct. Another thing I have seen is that can be helpful with problems like this is that the order of the titles be set with the blog title being listed last in the meta.php.
<?php wp_title('«', true, 'right'); ?> <?php bloginfo('name'); ?>
But I only know enough about that stuff to get myself in trouble
Hate to see you lose your ability to use such an awsome seo.