The problem is with Easy Populate not setting all of the switches for the product. You open the product in admin and the default radio buttons/values are set then recorded when you save the product and like you said each product magically works.
I spent some time trying to catch this exact error, the fix is to set the missing switches related to the product quantity.
There are some options depending on how you've got your cart setup but the important ones are:
- Products Quantity Box Shows = 0
- Product Qty Minimum = 1
- Product Qty Maximum = 0
- Product Qty Units = 1
- Product Qty Min/Unit Mix = 1
The value settings above fix the problem and hide the annoying min/max display.
To achieve this I set the switches with these SQL statements:
update products set products_qty_box_status = 0;
update products set products_quantity_order_min = 1;
update products set products_quantity_order_max = 0;
update products set products_quantity_order_units = 1;
update products set products_quantity_mixed = 1;
Be sure to backup your SQL before you run them.
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