It seems to appear from Low to normal. Haven't been able to test higher then that yet.

It seems to disapear when I turn off post fx as I suspected.

1920x1080 is my desktop resolution.

All files validated and tested and for the record the problem appeared when I was setting higher graphic settings on my pc. Didn't have the problem before so I suspect something is going on with post fx or a combination with something?

It doesn't get any better if i change my texture resolution so I have ruled that out for now.