Aperture D600 Raw Files too dark?

Is anyone else seeing that their Nikon D600 raw files stink in Aperture? I realize that Apple backwards engineers Raw support but if I look at a file from my D600 on Aperture and Capture NX2, the difference is 10-fold. I can see detail in the shadows in the NX2 conversion and nothing but black in the Aperture conversion. I have never seen this much of a disparity and I have used well over a dozen different DSLR's. I am curious if anyone else is seeing this? I mean in one image I can see a staircase in the NX2 conversion and nothing but black in Aperture?