So I have no idea what has gone wrong here, but my navcube is flipped around all funny like.
My model is still oriented properly, everything still reads the right way, and the world ucs seems to be fine as well.
Please see the picture... FYI - I was grading with feature lines and such.
So I am not sure if it is totally fixed or what could have happened.
I typed in orbit and spun the model around at some arbitrary angle. Then I switched over to the layout, clicked in a vp, and the navvcube looked fine.
Then I went back to the model and selected the TOP view from the dropdown in the ribbon.
Now the navvcube looks correct.
!?!?!?!? Buggy stuff?
Alternatively, you can type in GEO, and Remove the Geographic Location, and it will reset it.