On a brand new clean install of the latest version of Zen Cart without addons or customizations, when I add a new product with product-quantity greater than 0 and mark the product as enabled, it shows up in the New Products list just fine. It even shows up in the sideboxes and centerboxes, albeit in random order since those sideboxes/centerboxes show things randomly instead of always showing only the latest entries in date order.
So, I'm not sure what exactly you're talking about nor why you've posted this in the Bug Reports section.
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