New SanDisk Extreme Pro Memory Card type CF 16 GB UMDA 7 160 MB/s when installed with Sony XQD card in Nikon D4 camera is not functional, shows 'ERR' message and and consequently renders D4 not operational. When this CF card is installed on its own, without XQD card, in D4 then it works OK. As using one only memory card in D4 is UNACCEPTABLE for professional work I am looking for advice. As per today, 31 Oct 2013 Nikon doesn't have the clue of what is the problem there with D4