Dear Ivica,
If I change the theme to twentytwelve it works so your are doing things correctly and the problem lies in the theme.
This is a problem with Warp 6 (yootheme). What I did was to replace the contents of index.php with the normal WordPress loop:
<?php get_header(); while (have_posts()) { the_post(); the_title(); the_content(); } get_footer(); ?>
The theme understands this because there is code in header.php and footer.php to make normal templates work too.
Regards,
Caridad