Upgrading to latest version breaks site

Hi,

Have been used customizr on one of my familys sites for the last three years. However, the hosting service upgraded php which forced me to upgrade wordpress and consequently customizr.

The site is simply a collection of pages for the majority.
However, there is a blog section which is listed in a custom page.
This is what is broken.

I had taken the index.php page, renamed it and added the following just after the left sidebar hook –

<?php query_posts("post_type='post'&post_status='publish'&posts_per_page=10&paged=". get_query_var('paged')); ?>

The page does not display any posts now.
If I manually add the_title() just before do_action( '__loop' ); then titles are printed.
What needs to be done to get this working again properly, please ?