eBay launched a new "Checkout" feature on its site, and said today that its listing tools are not yet compatible with the feature. A version of Mister Lister with Checkout support will be available within a few days. Existing versions of Mister Lister will still be functional, but will not support Checkout. New versions of Seller's Assistant Basic and Pro with Checkout support will launch within a few weeks. Existing versions of these tools will continue to work normally, but will not support Checkout.