With Woocommerce update to 3.0 the invent theme no longer is compatible, with product images not showing up. Are you planning an update to make the theme work with the latest Woocommerce plugin update?
I tested the theme with the latest version of woocommerce 3.0.1 – shop, single product, cart and checkout and saw no issues. I am not sure what issues you are facing with woocommerce 3.0. Can you provide us a temp login here if the issue still persists with 3.0.1 version?
We do not have anyone else among our 12,000+ customers reporting these issues either even though 3.0 was released almost a week back.