I'm using LWCad 5.2 in LightWave 2018.4 trying to build a house. I've built the outer walls with the Wall tool, that's fine. But when I try to build the inner walls the polygons disappear every time it intersects a wall. The ends are fine but any polygon that touches another polygon disappears.I've tried messing with any option I can find. Add, Subtract, etc. I've never had this problem before.