Help!!!! I just got my D200 back from Nikon servicing, while out shooting the Marathon, my camera got an "err" message. Keep in mind, I had this same issue before sending it into Nikon for servicing, which was becuase of the 'autofocus' sensor according to Nikon. Once home, I changed the batteries to "Nikon" and went back to shooting with no problems. So has anyone else experienced this same issue with non Nikon batteries?