Having the same issue. Featured image is forced to out put the 150×150 size.
Edit: I have noticed there are changes to the classes as well.
I changed /wp-content/plugins/features-by-woothemes/woothemes-features-template.php line 92
from
$image_size = apply_filters( 'woothemes_features_image_size', 'thumbnail', $post );
to
$image_size = apply_filters( 'woothemes_features_image_size', array($args['size'],$args['size']), $post );
it worked for me.
Yes do not upgrade to 1.4 is screws up your whole settings!
I’m having the same problem and I really need to get this resolved!
The images should be 250 px wide but now they are 150 px after the upgrade.
http://www.elainewellman.com
Thanks Teguh! That did the trick – but I hate that I had to fuss with the plugin code.