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I wanted to put this here since it's the top question for this on stackexchange:

For all the people who've:

1. registered the sizes in their functions.php
2. set them in a callback for after_setup_theme with the add_action function
3. installed Regenerate Thumbnails
4. installed php5_gd and restarted the server

And sizes still aren't hard-cropping....

Check if GD is actually enabled as an extension by running this snippet in a .php file on the browser:

<?php if (extension_loaded('gd')) 
     { 
         echo "gd loaded"; 
     } else { 
         echo "not loaded"; 
} ?>

If it comes up with "not loaded", then try adding the line:

extension=gd.so

to the apache2/php.ini file. That was the end result after trying out all the other solutions online which ended with installing php5-gd: you may have to manually configure the loading of the extension afterwards.