Z axis is up in the Gmax world, that’s how it is. Does your model look right way up in the Left view? If so, I think you’re a bit baffled by the gizmo and its different modes versus the pivot - like most of us when first working with Gmax.
I’ve got a day’s work to do first, but I’ll post more this evening.
It works fine in FSX after exporting even thought I see it weird in MCX. But now the problem is the animated bus (I had an animated bus from gmax) is disappearing, only viewable from certain angles..such as a zoomed out view in top view.