Hi all. D700 and a 16-35 f/4 lens. Had just finished up a series of shots, all was fine. Went to switch from the wide to a long and when I pressed the lens release button and rotated, it didn't spin. Tried again and it was stuck where it was. Gave it a little jiggle the other way and it rotated. Past centre on the body. It's now a few degrees past where it's supposed to stop (white dot is probably at 11:00 looking at the front). I've not got the stomach to find out how far it goes to the right. Still does not turn the way it should with the lens release button pressed, but it will turn the wrong way without pressing the button. From what I can see, the lens mounts are not moving, the lens itself of moving on the mount. I don't even have a guess as to what's failed to allow this to happen. Took it to Camera Service Centre in Sydney and they politely declined to even touch it. Said they'd never seen anything like it. Both camera and body are in otherwise fine condition. Neither has been dropped and the mounts are not damaged. I'd actually swapped lenses (including to/from the 16-35mm) a couple times prior that same shoot. Anyone have any ideas I can try before lugging it over to Nikon and being told to go away?