The menuboard uses PHP to look at your postgres database. It looks at the inventory items and joins that information with the products tied to the inventory item. After it has located the product, it checks to see if the inventory items strain-type can be found. If your inventory item does not have a strain and corresponding strain-type, the menuboard will be unable to determine any strain-type data which some themes depend on.
All products that you want to show on the menuboard will need to havethe inventory type set, the product category set and atleast one price set. The menuboard will always start at the first price.