I set all my stock and product display settings correctly, to subtract items when they are ordered, and to display the current quantity in product listing, and to disallow checkout.

It won't subtract items that are purchased. Why would this happen? Where would I look?

I use AABox MS2-MAX v1.5.5 distribution of osCommerce 2.2 MS2. Other versions are being tested to see if they subtract. Does it work for all other users except me?

What versions are working?