Hi Hans,
With you helping me, with the Sweet Home windows position changing test, I do hope you won't mind I had a go at opening your home model.
It opened okay without any problems using Sweet Home 2.3 running on Windows 7. There was a slight delay as parts were drawn but otherwise it loaded and displayed okay.
So you know I have opened your model, I made the two slopping roof parts visible again, then
(also in case it helps solve the problem) I re-saved the model with version 2.3 for you to try.
House with double roof re-saved with version 2.3
db4tech