I'm using Version 0.7.2 of Crop Thumbnails with WordPress 3.5. I guess 3.5 isn't supported yet, but I've come across an error when trying to update the Sizes and Posttypes. It doesn't seem to matter which posttype or size I select, I'll still get this error.
Warning: Invalid argument supplied for foreach() in /home/devallen/public_html/wp-content/plugins/crop-thumbnails/functions/settings.php on line 175
Warning: Cannot modify header information - headers already sent by (output started at /home/devallen/public_html/wp-content/plugins/crop-thumbnails/functions/settings.php:175) in /home/devallen/public_html/wp-includes/pluggable.php on line 881