I had this exact problem Doing a survey at a school building. Failed about halfway through the main floor. I was using an older macbook with 2GB RAM. It would hang anytime it tried to do a visualization.
Later, I coppied the project file over to my new MacBook Pro with I7 and 8GB RAM, it worked wonderfully. I was able to use the Pro version and scan 4 floors. All in the same project.
