Weird AF Issue

JJPhotos

OK, here's a new one! My D810 isn't giving me the option of 'D9'. It's doing S, 21 and 51 but not 9!

I've tried everything I can think of including resetting the camera. I thought it was me having a dim moment (and maybe I am) but I've double checked on my D4s and it definitely has the option.

Any ideas out there as to what might be going on?

JJPhotos

Yep, OK. Menu item a11 'Limit AF-area mode selection' - the option for d9 was unchecked. I have no memory of changing it but there is was (or wasn't as the case may be). Survived two hard resets as well!