Download Products - Out of Stock

My site has both download and physical products that need to track stock.

I had a downloadable test product that worked fine.

I added a products with attributes for different downloads.

All products have more than 1 in stock.

I have the attributes set at 0 (unlimited) for expiration and 500 for the number of downloads.

But now the downloads show as 'out of stock' even for the test product that worked before.

I changed admin/configuration/stock/check_stock_level and it is okay - but that is a system wide change affecting physical products too.

Why would the quantity start having issues? Do you really need to turn off check_stock_levels to make this work?

thanks

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