There are issues in the Z3 address area with other cards; drop it into the Z2 address and check it. You can also remove other Z3 cards (ZorRam, BRP, Mediator) and see if it works. The card will show up in Z3 mode (firmware is read) but the cramped address space will not let it function. In Z2 mode it takes up far less space, but is also slower. For Z3 cards address space, the order they are installed is crucial.