Thought it might be keyboard, too. But, F10 worked for other views.
I noticed there was a Look Back Up view that had no key assigned. I always have used a combo key, back and up on keypad, and those keys are mapped to my stick which works find. F10 wasn't working after adjusting my view. So I assigned a key to Look Back Up. Then I could use that key for the view, and move my "head" using pg up and pg down and the arrow keys. This time when I hit F10, the new head position was saved. I cleared the key assignment. Then tested with the up/back key combination and all was good.
Weird.