System Information
Windows 8.1
GTX Titan
Blender Version
Broken: 2.70a
Worked: (optional)
Short description of error
Simple close Blender!
Exact steps for others to reproduce the error
Please, see the file below and try to make a face in that 4 vertex in front of building. Simple close Blender! And I don't know why the faces is that way, noises when we see around.