with the development version.
OS: Ubuntu 16.04.5 LTS
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.15221 (Git)
Build type: Release
Branch: master
Hash: fc5b6288c6eb4fe89192f63f1fbdf4a43c0fad27
Python version: 2.7.12
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: Spanish/Spain (es_ES)

- windows.png (470.97 KiB) Viewed 578 times
I'm going a little bit slow due to that I don't achieve to manage the windows clones. Also, a bad result with copy and paste the windows. I see that the additions and subtractions system of the walls with the windows is not reflected in the task and properties panels. Probably all problems yet reported.
Also, some little problems with recomputing some draft lines.
In general, a big file's stability. No crash! Congratulations!