MarketPress 2.5.8 Beta – Login Checkout Customization

It appears that MarketPlace 2.5.8 Beta-1 is forcing login, even when “Force Login” option is not selected.

I am able to add an item to my shopping cart when not logged in. However, when I go to the checkout page, the checkout button has been replaced by a login form.

Am I missing something here or is this a bug?