I’ve tried to exend a wall until it reach another wall resulting in a T connection without a crash. Can you send me a sample model and the steps to reproduce the crash?
I tried also to create 4 walls and a space in a hidden viewport, and I can select the space without problems. Can you send me also a model where your’re seeing this issue?
Again, I tried to save the model with the 4 walls and the space in Rhino 6 using a Rhino 5 format, and I have been able to open it in Rhino 5 with VisualARQ 2.1. Are you using VisualARQ 2.1 in Rhino 5? VisualARQ 2.0 cannot open files from VisualARQ 2.1.
I’m unable to reproduce this issue. Can you send me an screenshot?