Hi Val, MoI v4 can export to a 2016 FBX version, there is some info on how to set it here:
http://moi3d.com/forum/index.php?webtag=MOI&msg=8683.9

MoI does not recognize a value of 2017 in there, so if you have that it will default to the same one as MoI v3 which is 2010.

If you put in 2016 does that then work ok? I guess the problem is that there was a big change in FBX starting with version 7.4/2016 to make it 64-bit and that broke compatibility.

- Michael