
I try replace a pylon but the same thing is happening. I got the same issue with Green and Red wire.
There is my graphic setup :

My savegame : https://www.dropbox.com/s/oi7icgl4wbx4fcp/Save.zip?dl=0
My computer :
Windows 8.1 x64
i5-3570K
24Go RAM
AMD HD 7800
I don't know if there is more information I can post. Ask if you need I will try to find them.