Coursepress/Marketpress checkout page on mobile

In Coursepress there is an option to automatically resize featured images for courses to a certain size. That functionality does not seem to work. This becomes a bit of a hassle with Marketpress: on a phone/tablet Marketpress does not display a thumbnail but the full image in the checkout page. Effect: messy page.
Two questions:
- can you check the autoresize/upload feature;
- can we turn off images in the Marketpress checkout page.