Deep focus is a nice wordpress theme by elegent themes

However it has some minor bugs. I had to fix them and may be it will help you too

Thumb nails not working for single pages.

To corect it go to theme folder open single.php

Around line 60 delete following
<!– Just delete

<a href=”<?php echo $image; ?>” class=”fancybox”>
<img src=”<?php //echo $image; ?>” alt=”<?php the_title(); ?>” />
–>

Add this instead

<!– Just add by me –>
<div class=”fancybox”>
<?php echo $image; ?>
</div>