This just happened to me. I was almost complete testing an upgrade from 1.3.6 to 1.3.8a, finished my long list of add-on merges and was testing literally the last one, COWOA. That included changing configuration setting (split login) and I was checking out the look of CSS buttons. The starting prices disappeared.
Classic template shows exactly the same thing. It was working yesterday. I checked, all the products have a master_categories_id. Nothing had changed for the product definitions or their attributes, all that was imported correctly a long time ago and I'm not changing any category/product/attribute definition.
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