[Plugin: WP e-Commerce] Thumbnails on product page only follows default size

Hi I need advice/help.

I’ve already tried the plugin forum but no reply so far. I’ve been hounded by this problem for months already. My problem is the default product page image size. It is fine for the landscape photos, but for the portrait images, it crops it and turns it into landscape ones and they look so silly. I’ve tried over and over again fixing it for the product image option but it really wont change. Does anybody know what I can do, like maybe edit something? I am not so knowledgeable with this and would like help. you can see what i am referring to here .