I don’t recall if we cleared this up in our email conversation, but with regards to having a custom fbx build, we do not. We’re using 2014.1 Release(214447) in Maya 2014.
Also, as far as importing goes, I believe it will import according to the FBX version of the file being imported. So, if you try to import a 2016 fbx into 2014, you’ll end up with a blank scene. If you imported using the import motion tool, it would have done the timeline adjustment and brought in nothing (at least, that’s what happened to me when I just tested a 2016 FBX in 2014)