It would be very usefull for the customer if he sees a thumb of his personalized products during the checkout process. Right now he only sees the product image.

 Same here. When I add a product to cart, I get blank pages. Theme isn't overwriting any woocommerce part, only 'wrap start' disposition in single product pages. All Woocommerce templates are originals...

 Solved in my case. Need to remove image product. When I was inspecting the thumbnail under firebug, I seen that img sorce was the designed product, but thumbail still original image product!!! When I removed that product image, then show the fancy image :/

Doens't work for me neither.

Thank's Raúl, that tweak also works for me now. Unfortunately there is no product photo anymore.

Great! Looking forward for the update.

I have the same problem. Not changing product image after design is done and not changing image in cart... Thank you for answer.

Rafael Dery, your new function change_cart_item_thumbnail works, the image is changed in chart. 

I continue to have a problem and wait for a solution to change product image after design is done. I use Wordpress 4.4.1, Woocommerce 2.5.2, Betheme 11.4 Shop theme, Fancy Produc Designer 2.2.4 . Thank you.

Hey! Thanks for the update on this.

Do you already have an idea when the update is coming?

I'm working on a prototype for a client and He's asking for a preview in the cart, so the customer is sure have to correct product.

Thanks and have a great day!

 Thanks for the job, man. Waiting for the update, certainly it is a very important feature...

Hey! Thanks for the snippets, but unfortunately, I'm getting an error on the page. 

It would be much appreciated if you could have a new look at your code and share a new working one :)

Or let us know approximately when the update is coming.

Right now, I'm overriding the thumbnails of every product on the category page with CSS... not very convenient.

Thanks a lot!