Black brushes

[Seitan]

This issue happens only with round corners in my map, what can I do to solve this?


http://imgur.com/a/RAJa6

 

[theatreTECHIE]

I had this happen to me a few times. One way that apparently fixed it for me was to have the texture aligned with the world (checkbox in texture application window) with texture shift as 0 for x and 0 for y.