Nikon D200. I'm reading the files across a network, with the files stored on the computer to which they were transferred from the camera. I think it may be a network issue, since PM reads JPGs across the network just fine, and reads NEFs on the local machine just fine. It just won't read NEFs across the network.
After testing, I found that CS2 and Nikon View are in the same boat. Sounding even more like a network issue, no?