Windows 10 Home, 3xGTX 980Ti
Broken: (example: 2.79 5bd8ac9, 2017-09-11 10:49)
1 - I worked in file, when created in Blender 2.78 - of course I worked in Blender 2.79
Dos't work Modifier - Subsurf,
When I created new scene - Subsurf works correctly
In This file I have only 2 object - UV Sphere, and this file weighs 475 MB
Of course, I had different scene and objects - but I all removed and I do "Orphan Data" - "Purge All"