it's a bug in NX nastran, they reported it.
Good news is Nei have posted a month's lease on there website to use NEINastran for a month or whatever it takes to fix it. Could keep you going - neat marketing from someone at Noran to spot the problem and make the offer.
Check out NEiNastran - there website has a good deal offering a lease on NEINastran to get you out of trouble. They posted it today so I guess you may get a good discount. NEiNastran is pretty cloes to NX. A lot of usrs seem to like it better.