Hi Chris,
Thanks for taking the time to look at this, sorry I haven't had time to come back since, it's been a busy week.
I have found the problem this morning, I had some code in my functions.php to include a Login/Logout link in my menu which I got from here:
function autov_add_loginout_navitem($items) {
$login_item = '<li class="login menu-item">'.wp_loginout($_SERVER['REQUEST_URI'], false).'</li>';
$items .= $login_item;
return $items;
}
add_filter('wp_nav_menu_items', 'autov_add_loginout_navitem');
Removing it fixed the problem though I am now missing my handy login/logout menu item. If you have any ideas (and the time to look) as to why this bit of code is conflicting with your excellent plugin please let me know.