The selector fork was bent. I was able to pry it back without removing the front differential, just removed the servo mechanism, placed a 3/8 socket extension between the sliding block and the housing and used a long screw driver to bend fork to the left ... in direction of 4whl lock. Working now ... seems like maybe a weak link in the system yet have not heard of too many having this problem - so maybe not. The only thing that I can ever remember that may have caused it, and when I noticed it was not working, was shifting on-the-fly when going through a mud hole, but then again I am not sure it ever worked prior to that, I bought it several years ago and it was a used machine. Moral of the story ... I guess ... make sure you are stopped when shifting your front differential.
PS I have never encountered a web site with this much advertising! Makes it painful to get around.