I am seeing it in both NX 10 and NX 11, your image looks like it is still using the section line for the hinge line. Move up and define a new hinge line first and then see what happens. Also di d you reset the menu?
I've the same problem.
I would like that the section view is rotated so line become vertical. I need to rotate the view or during the section dialog I'm able to set correctly ?