Since I am in the UK that would be a pricey call, and I don't in any event have the experience of working with dual-chip systems so my knowledge is purely theoretical. If he's confident that the right card is being used. There was, recently, a problem with the tool that was meant to switch the chipset in use which was causing the DAZ Bitrock installers to crash, even on systems that didn't really have two active adaptors. There is some discussion of the issue here and on the immediately preceding pages http://www.daz3d.com/forums/viewreply/322772/