This kind of bug may leave some traces in the console output.
If you’re under Windows, please run cmd, drag and drop SweetHome3D.exe in the cmd window, add a space and the parameter 2> output.txt, type return key and try to reproduce the bug.
This will create an [font=courier new]output.txt[/font] file that you can share or [url=mailto:[email protected]]send to me[/url] .