Are you sure that they are totally locked down. The fasteners may be coincident and concentric but nothing to keep them from rotating. I can only guess that the answer is not what I just said but other than that it's nothing Ctrl-Q can't take care of.
KM
I had an NVS an yes you are in trouble. The NVS I had was not PCI express but I suggest swapping that card out soon. It will work but it will bring everything to a crawl and then you will have to shut down and restart just to clear it out.
KM
A place I am no longer at went from SolidWorks to IronCAD back to SolidWorks. Since IronCAD is all but gone (I heard only 3,000 seats worldwide once) there is nothing that anyone writes to help with this. When I was there, there were three things we did.
a) exported to parasolid and brought...