Black Artifacts in some tracks

I am having an annoying problem after the latest release which is basically giving me black artifacts in some tracks. I tried deleting shader + cbash folders a lot of times but the problem is still there.

Graphic Card: R9 280

It looks like some anti-aliasing problem so I decided to unable anisotropic + anti-aliasing but the problem is still there, so I can't find a solution. This is happening in some tracks, not just one.

Here are some screenshots:

https://i.imgur.com/6XABEI3.jpg
https://i.imgur.com/YVugEAs.jpg
https://i.imgur.com/hkyiAoV.jpg
https://i.imgur.com/y2tFGCR.jpg

 

same here, only at road atlanta in my case

 

I am having in Abu Dhabi and others too.

 

Same here, R9 290.
Road Atlanta Modder is aware of it.
Someone offered advice to turn off PP and should work but I have not been back to this great version of the track to try.

 

Then would turning off PP be useful?