Ok I have gotten it to happen a couple of more times. It always happens when I have several houses on there, and I am adding more (Using the house tool, and not the symbols). After I have several and I am adding more, and I do something unusual like click the wrong mouse button, or click off of the map, or click on the zoom two times, then it freaks and crashes. I think it is trying to redraw or to generate an error message when it goes.

I don't know if it is useful, but I have the information from the "crash" report that it sends to Microsoft.