Secure-Resizer seems to interfere with default WP funcionality:
Error message in browser:
Catchable fatal error: Object of class WP_Error could not be converted to string in /path-to/secure-resizer.php on line 44
In functions.php:
add_image_size('half-column',480,464, true);
In the loop of the theme:
<?php the_post_thumbnail('half-column'); ?>