This is the venator model I'm talking about here. At the nose, it has a flat front where the hangar entrance is supposed to be. I insert the box through this flat surface. Mind you, the area where the box penetrates the surface of the model is compltely flat, no bends nothing. The box does not cross over any edges or points. All of the intersecting edges are contained within a single polygon.
Here's a pic so you'll understand.

[edit] ugh, I messed up the pic, just take my work for it that there are no edges there. That octagon on the front is a single polygon.
Now when I hit Boolean difference, and pick the box, XSI freezes up. I am not sure why. I've done this before with a simple two boxes intersecting each other. This box only crosses the model in one location and its very simple too. I don't understand why XSI is taking so much power to accomplish this simple task. I used a fairly long box there, but even with a short box, it doesn't work.





