Well, I just finished testing the uc_simpleinventory module, and it does not decrease stock in the uc_simpleinventory table upon ordering.

Looking through the module, I believe I understand how it's supposed to work (just like I think I understand how the Inventory API module is supposed to work).

Again, it appears that the function uc_simpleinventory_order is not getting called by hook_order when the cart is finally submitted. But I can't figure out why.

I assume you use simpleinventory for http://www.vingowine.com ???