I tried to create a new group called "house only" which would be only light on the house vs my wholehouse which should really be renamed to wholedisplay. Program crashed when I got to the last couple of models. I was clicking the arrow pretty fast to move models to the new group and got a couple to many. Used the left arrow to remove and then went back to add the windows when it crashed.
Restarted and tried again. Used a different group name as the first one was not present. Used "HouseOnly" Crashed as soon as I clicked the first model to add which was G1-L.
I've included both crash reports.