I've just installed v4.7a onto Zen Cart 1.3.8a
The admin side works fine, I can add stock to each attribute and if I sync the product total also updates.
However, on the site, the checkout is using the total product stock rather than the attribute stock - I have "check stock level" set to TRUE.
I've read the FAQ and checked that the files uploaded ok, which they seem to have, so anyone any ideas as to what could be causing this?