Not to highjack Jaffel's thread, but this is also happening to me and I DID create the ISO via Fusion.
Error is "DHCP client has obtained an IP address that is already in use on the network" (note.. the IP addresses in question aren't "in use"). This even when I set DHCP reservation. My DHCP will fill with leases all with weird MAC addresses because of this. NAT and Host only networking works "as expected".
It has worked twice in the last 30 days and I have no clue what I did to make it work.