Ok so I tried hooking up my D800E with my USB3.0 cable and all pictures and videos (from both CF and SD cards) imported as normal in LR4.3. Also tried CaptureNX2 and it reads images correctly also right out of the camera. My next question would be what USB cable are you using??? Is it the one that came with the D800 or a standard USB2.0 cable and is it plugged into the correct USB port on the computer????